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laywerrobot/lib/python3.6/site-packages/scipy/special/add_newdocs.py

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2020-08-27 21:55:39 +02:00
# Docstrings for generated ufuncs
#
# The syntax is designed to look like the function add_newdoc is being
# called from numpy.lib, but in this file add_newdoc puts the
# docstrings in a dictionary. This dictionary is used in
# _generate_pyx.py to generate the docstrings for the ufuncs in
# scipy.special at the C level when the ufuncs are created at compile
# time.
from __future__ import division, print_function, absolute_import
docdict = {}
def get(name):
return docdict.get(name)
def add_newdoc(place, name, doc):
docdict['.'.join((place, name))] = doc
add_newdoc("scipy.special", "_sf_error_test_function",
"""
Private function; do not use.
""")
add_newdoc("scipy.special", "sph_harm",
r"""
sph_harm(m, n, theta, phi)
Compute spherical harmonics.
The spherical harmonics are defined as
.. math::
Y^m_n(\theta,\phi) = \sqrt{\frac{2n+1}{4\pi} \frac{(n-m)!}{(n+m)!}}
e^{i m \theta} P^m_n(\cos(\phi))
where :math:`P_n^m` are the associated Legendre functions; see `lpmv`.
Parameters
----------
m : array_like
Order of the harmonic (int); must have ``|m| <= n``.
n : array_like
Degree of the harmonic (int); must have ``n >= 0``. This is
often denoted by ``l`` (lower case L) in descriptions of
spherical harmonics.
theta : array_like
Azimuthal (longitudinal) coordinate; must be in ``[0, 2*pi]``.
phi : array_like
Polar (colatitudinal) coordinate; must be in ``[0, pi]``.
Returns
-------
y_mn : complex float
The harmonic :math:`Y^m_n` sampled at ``theta`` and ``phi``.
Notes
-----
There are different conventions for the meanings of the input
arguments ``theta`` and ``phi``. In SciPy ``theta`` is the
azimuthal angle and ``phi`` is the polar angle. It is common to
see the opposite convention, that is, ``theta`` as the polar angle
and ``phi`` as the azimuthal angle.
Note that SciPy's spherical harmonics include the Condon-Shortley
phase [2]_ because it is part of `lpmv`.
With SciPy's conventions, the first several spherical harmonics
are
.. math::
Y_0^0(\theta, \phi) &= \frac{1}{2} \sqrt{\frac{1}{\pi}} \\
Y_1^{-1}(\theta, \phi) &= \frac{1}{2} \sqrt{\frac{3}{2\pi}}
e^{-i\theta} \sin(\phi) \\
Y_1^0(\theta, \phi) &= \frac{1}{2} \sqrt{\frac{3}{\pi}}
\cos(\phi) \\
Y_1^1(\theta, \phi) &= -\frac{1}{2} \sqrt{\frac{3}{2\pi}}
e^{i\theta} \sin(\phi).
References
----------
.. [1] Digital Library of Mathematical Functions, 14.30.
http://dlmf.nist.gov/14.30
.. [2] https://en.wikipedia.org/wiki/Spherical_harmonics#Condon.E2.80.93Shortley_phase
""")
add_newdoc("scipy.special", "_ellip_harm",
"""
Internal function, use `ellip_harm` instead.
""")
add_newdoc("scipy.special", "_ellip_norm",
"""
Internal function, use `ellip_norm` instead.
""")
add_newdoc("scipy.special", "_lambertw",
"""
Internal function, use `lambertw` instead.
""")
add_newdoc("scipy.special", "wrightomega",
r"""
wrightomega(z, out=None)
Wright Omega function.
Defined as the solution to
.. math::
\omega + \log(\omega) = z
where :math:`\log` is the principal branch of the complex logarithm.
Parameters
----------
z : array_like
Points at which to evaluate the Wright Omega function
Returns
-------
omega : ndarray
Values of the Wright Omega function
Notes
-----
.. versionadded:: 0.19.0
The function can also be defined as
.. math::
\omega(z) = W_{K(z)}(e^z)
where :math:`K(z) = \lceil (\Im(z) - \pi)/(2\pi) \rceil` is the
unwinding number and :math:`W` is the Lambert W function.
The implementation here is taken from [1]_.
See Also
--------
lambertw : The Lambert W function
References
----------
.. [1] Lawrence, Corless, and Jeffrey, "Algorithm 917: Complex
Double-Precision Evaluation of the Wright :math:`\omega`
Function." ACM Transactions on Mathematical Software,
2012. :doi:`10.1145/2168773.2168779`.
""")
add_newdoc("scipy.special", "agm",
"""
agm(a, b)
Compute the arithmetic-geometric mean of `a` and `b`.
Start with a_0 = a and b_0 = b and iteratively compute::
a_{n+1} = (a_n + b_n)/2
b_{n+1} = sqrt(a_n*b_n)
a_n and b_n converge to the same limit as n increases; their common
limit is agm(a, b).
Parameters
----------
a, b : array_like
Real values only. If the values are both negative, the result
is negative. If one value is negative and the other is positive,
`nan` is returned.
Returns
-------
float
The arithmetic-geometric mean of `a` and `b`.
Examples
--------
>>> from scipy.special import agm
>>> a, b = 24.0, 6.0
>>> agm(a, b)
13.458171481725614
Compare that result to the iteration:
>>> while a != b:
... a, b = (a + b)/2, np.sqrt(a*b)
... print("a = %19.16f b=%19.16f" % (a, b))
...
a = 15.0000000000000000 b=12.0000000000000000
a = 13.5000000000000000 b=13.4164078649987388
a = 13.4582039324993694 b=13.4581390309909850
a = 13.4581714817451772 b=13.4581714817060547
a = 13.4581714817256159 b=13.4581714817256159
When array-like arguments are given, broadcasting applies:
>>> a = np.array([[1.5], [3], [6]]) # a has shape (3, 1).
>>> b = np.array([6, 12, 24, 48]) # b has shape (4,).
>>> agm(a, b)
array([[ 3.36454287, 5.42363427, 9.05798751, 15.53650756],
[ 4.37037309, 6.72908574, 10.84726853, 18.11597502],
[ 6. , 8.74074619, 13.45817148, 21.69453707]])
""")
add_newdoc("scipy.special", "airy",
r"""
airy(z)
Airy functions and their derivatives.
Parameters
----------
z : array_like
Real or complex argument.
Returns
-------
Ai, Aip, Bi, Bip : ndarrays
Airy functions Ai and Bi, and their derivatives Aip and Bip.
Notes
-----
The Airy functions Ai and Bi are two independent solutions of
.. math:: y''(x) = x y(x).
For real `z` in [-10, 10], the computation is carried out by calling
the Cephes [1]_ `airy` routine, which uses power series summation
for small `z` and rational minimax approximations for large `z`.
Outside this range, the AMOS [2]_ `zairy` and `zbiry` routines are
employed. They are computed using power series for :math:`|z| < 1` and
the following relations to modified Bessel functions for larger `z`
(where :math:`t \equiv 2 z^{3/2}/3`):
.. math::
Ai(z) = \frac{1}{\pi \sqrt{3}} K_{1/3}(t)
Ai'(z) = -\frac{z}{\pi \sqrt{3}} K_{2/3}(t)
Bi(z) = \sqrt{\frac{z}{3}} \left(I_{-1/3}(t) + I_{1/3}(t) \right)
Bi'(z) = \frac{z}{\sqrt{3}} \left(I_{-2/3}(t) + I_{2/3}(t)\right)
See also
--------
airye : exponentially scaled Airy functions.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
Examples
--------
Compute the Airy functions on the interval [-15, 5].
>>> from scipy import special
>>> x = np.linspace(-15, 5, 201)
>>> ai, aip, bi, bip = special.airy(x)
Plot Ai(x) and Bi(x).
>>> import matplotlib.pyplot as plt
>>> plt.plot(x, ai, 'r', label='Ai(x)')
>>> plt.plot(x, bi, 'b--', label='Bi(x)')
>>> plt.ylim(-0.5, 1.0)
>>> plt.grid()
>>> plt.legend(loc='upper left')
>>> plt.show()
""")
add_newdoc("scipy.special", "airye",
"""
airye(z)
Exponentially scaled Airy functions and their derivatives.
Scaling::
eAi = Ai * exp(2.0/3.0*z*sqrt(z))
eAip = Aip * exp(2.0/3.0*z*sqrt(z))
eBi = Bi * exp(-abs(2.0/3.0*(z*sqrt(z)).real))
eBip = Bip * exp(-abs(2.0/3.0*(z*sqrt(z)).real))
Parameters
----------
z : array_like
Real or complex argument.
Returns
-------
eAi, eAip, eBi, eBip : array_like
Airy functions Ai and Bi, and their derivatives Aip and Bip
Notes
-----
Wrapper for the AMOS [1]_ routines `zairy` and `zbiry`.
See also
--------
airy
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "bdtr",
r"""
bdtr(k, n, p)
Binomial distribution cumulative distribution function.
Sum of the terms 0 through `k` of the Binomial probability density.
.. math::
\mathrm{bdtr}(k, n, p) = \sum_{j=0}^k {{n}\choose{j}} p^j (1-p)^{n-j}
Parameters
----------
k : array_like
Number of successes (int).
n : array_like
Number of events (int).
p : array_like
Probability of success in a single event (float).
Returns
-------
y : ndarray
Probability of `k` or fewer successes in `n` independent events with
success probabilities of `p`.
Notes
-----
The terms are not summed directly; instead the regularized incomplete beta
function is employed, according to the formula,
.. math::
\mathrm{bdtr}(k, n, p) = I_{1 - p}(n - k, k + 1).
Wrapper for the Cephes [1]_ routine `bdtr`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "bdtrc",
r"""
bdtrc(k, n, p)
Binomial distribution survival function.
Sum of the terms `k + 1` through `n` of the binomial probability density,
.. math::
\mathrm{bdtrc}(k, n, p) = \sum_{j=k+1}^n {{n}\choose{j}} p^j (1-p)^{n-j}
Parameters
----------
k : array_like
Number of successes (int).
n : array_like
Number of events (int)
p : array_like
Probability of success in a single event.
Returns
-------
y : ndarray
Probability of `k + 1` or more successes in `n` independent events
with success probabilities of `p`.
See also
--------
bdtr
betainc
Notes
-----
The terms are not summed directly; instead the regularized incomplete beta
function is employed, according to the formula,
.. math::
\mathrm{bdtrc}(k, n, p) = I_{p}(k + 1, n - k).
Wrapper for the Cephes [1]_ routine `bdtrc`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "bdtri",
"""
bdtri(k, n, y)
Inverse function to `bdtr` with respect to `p`.
Finds the event probability `p` such that the sum of the terms 0 through
`k` of the binomial probability density is equal to the given cumulative
probability `y`.
Parameters
----------
k : array_like
Number of successes (float).
n : array_like
Number of events (float)
y : array_like
Cumulative probability (probability of `k` or fewer successes in `n`
events).
Returns
-------
p : ndarray
The event probability such that `bdtr(k, n, p) = y`.
See also
--------
bdtr
betaincinv
Notes
-----
The computation is carried out using the inverse beta integral function
and the relation,::
1 - p = betaincinv(n - k, k + 1, y).
Wrapper for the Cephes [1]_ routine `bdtri`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "bdtrik",
"""
bdtrik(y, n, p)
Inverse function to `bdtr` with respect to `k`.
Finds the number of successes `k` such that the sum of the terms 0 through
`k` of the Binomial probability density for `n` events with probability
`p` is equal to the given cumulative probability `y`.
Parameters
----------
y : array_like
Cumulative probability (probability of `k` or fewer successes in `n`
events).
n : array_like
Number of events (float).
p : array_like
Success probability (float).
Returns
-------
k : ndarray
The number of successes `k` such that `bdtr(k, n, p) = y`.
See also
--------
bdtr
Notes
-----
Formula 26.5.24 of [1]_ is used to reduce the binomial distribution to the
cumulative incomplete beta distribution.
Computation of `k` involves a search for a value that produces the desired
value of `y`. The search relies on the monotonicity of `y` with `k`.
Wrapper for the CDFLIB [2]_ Fortran routine `cdfbin`.
References
----------
.. [1] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
.. [2] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
""")
add_newdoc("scipy.special", "bdtrin",
"""
bdtrin(k, y, p)
Inverse function to `bdtr` with respect to `n`.
Finds the number of events `n` such that the sum of the terms 0 through
`k` of the Binomial probability density for events with probability `p` is
equal to the given cumulative probability `y`.
Parameters
----------
k : array_like
Number of successes (float).
y : array_like
Cumulative probability (probability of `k` or fewer successes in `n`
events).
p : array_like
Success probability (float).
Returns
-------
n : ndarray
The number of events `n` such that `bdtr(k, n, p) = y`.
See also
--------
bdtr
Notes
-----
Formula 26.5.24 of [1]_ is used to reduce the binomial distribution to the
cumulative incomplete beta distribution.
Computation of `n` involves a search for a value that produces the desired
value of `y`. The search relies on the monotonicity of `y` with `n`.
Wrapper for the CDFLIB [2]_ Fortran routine `cdfbin`.
References
----------
.. [1] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
.. [2] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
""")
add_newdoc("scipy.special", "binom",
"""
binom(n, k)
Binomial coefficient
See Also
--------
comb : The number of combinations of N things taken k at a time.
""")
add_newdoc("scipy.special", "btdtria",
r"""
btdtria(p, b, x)
Inverse of `btdtr` with respect to `a`.
This is the inverse of the beta cumulative distribution function, `btdtr`,
considered as a function of `a`, returning the value of `a` for which
`btdtr(a, b, x) = p`, or
.. math::
p = \int_0^x \frac{\Gamma(a + b)}{\Gamma(a)\Gamma(b)} t^{a-1} (1-t)^{b-1}\,dt
Parameters
----------
p : array_like
Cumulative probability, in [0, 1].
b : array_like
Shape parameter (`b` > 0).
x : array_like
The quantile, in [0, 1].
Returns
-------
a : ndarray
The value of the shape parameter `a` such that `btdtr(a, b, x) = p`.
See Also
--------
btdtr : Cumulative density function of the beta distribution.
btdtri : Inverse with respect to `x`.
btdtrib : Inverse with respect to `b`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfbet`.
The cumulative distribution function `p` is computed using a routine by
DiDinato and Morris [2]_. Computation of `a` involves a search for a value
that produces the desired value of `p`. The search relies on the
monotonicity of `p` with `a`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] DiDinato, A. R. and Morris, A. H.,
Algorithm 708: Significant Digit Computation of the Incomplete Beta
Function Ratios. ACM Trans. Math. Softw. 18 (1993), 360-373.
""")
add_newdoc("scipy.special", "btdtrib",
r"""
btdtria(a, p, x)
Inverse of `btdtr` with respect to `b`.
This is the inverse of the beta cumulative distribution function, `btdtr`,
considered as a function of `b`, returning the value of `b` for which
`btdtr(a, b, x) = p`, or
.. math::
p = \int_0^x \frac{\Gamma(a + b)}{\Gamma(a)\Gamma(b)} t^{a-1} (1-t)^{b-1}\,dt
Parameters
----------
a : array_like
Shape parameter (`a` > 0).
p : array_like
Cumulative probability, in [0, 1].
x : array_like
The quantile, in [0, 1].
Returns
-------
b : ndarray
The value of the shape parameter `b` such that `btdtr(a, b, x) = p`.
See Also
--------
btdtr : Cumulative density function of the beta distribution.
btdtri : Inverse with respect to `x`.
btdtria : Inverse with respect to `a`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfbet`.
The cumulative distribution function `p` is computed using a routine by
DiDinato and Morris [2]_. Computation of `b` involves a search for a value
that produces the desired value of `p`. The search relies on the
monotonicity of `p` with `b`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] DiDinato, A. R. and Morris, A. H.,
Algorithm 708: Significant Digit Computation of the Incomplete Beta
Function Ratios. ACM Trans. Math. Softw. 18 (1993), 360-373.
""")
add_newdoc("scipy.special", "bei",
"""
bei(x)
Kelvin function bei
""")
add_newdoc("scipy.special", "beip",
"""
beip(x)
Derivative of the Kelvin function `bei`
""")
add_newdoc("scipy.special", "ber",
"""
ber(x)
Kelvin function ber.
""")
add_newdoc("scipy.special", "berp",
"""
berp(x)
Derivative of the Kelvin function `ber`
""")
add_newdoc("scipy.special", "besselpoly",
r"""
besselpoly(a, lmb, nu)
Weighted integral of a Bessel function.
.. math::
\int_0^1 x^\lambda J_\nu(2 a x) \, dx
where :math:`J_\nu` is a Bessel function and :math:`\lambda=lmb`,
:math:`\nu=nu`.
""")
add_newdoc("scipy.special", "beta",
"""
beta(a, b)
Beta function.
::
beta(a, b) = gamma(a) * gamma(b) / gamma(a+b)
""")
add_newdoc("scipy.special", "betainc",
"""
betainc(a, b, x)
Incomplete beta integral.
Compute the incomplete beta integral of the arguments, evaluated
from zero to `x`::
gamma(a+b) / (gamma(a)*gamma(b)) * integral(t**(a-1) (1-t)**(b-1), t=0..x).
Notes
-----
The incomplete beta is also sometimes defined without the terms
in gamma, in which case the above definition is the so-called regularized
incomplete beta. Under this definition, you can get the incomplete beta by
multiplying the result of the scipy function by beta(a, b).
""")
add_newdoc("scipy.special", "betaincinv",
"""
betaincinv(a, b, y)
Inverse function to beta integral.
Compute `x` such that betainc(a, b, x) = y.
""")
add_newdoc("scipy.special", "betaln",
"""
betaln(a, b)
Natural logarithm of absolute value of beta function.
Computes ``ln(abs(beta(a, b)))``.
""")
add_newdoc("scipy.special", "boxcox",
"""
boxcox(x, lmbda)
Compute the Box-Cox transformation.
The Box-Cox transformation is::
y = (x**lmbda - 1) / lmbda if lmbda != 0
log(x) if lmbda == 0
Returns `nan` if ``x < 0``.
Returns `-inf` if ``x == 0`` and ``lmbda < 0``.
Parameters
----------
x : array_like
Data to be transformed.
lmbda : array_like
Power parameter of the Box-Cox transform.
Returns
-------
y : array
Transformed data.
Notes
-----
.. versionadded:: 0.14.0
Examples
--------
>>> from scipy.special import boxcox
>>> boxcox([1, 4, 10], 2.5)
array([ 0. , 12.4 , 126.09110641])
>>> boxcox(2, [0, 1, 2])
array([ 0.69314718, 1. , 1.5 ])
""")
add_newdoc("scipy.special", "boxcox1p",
"""
boxcox1p(x, lmbda)
Compute the Box-Cox transformation of 1 + `x`.
The Box-Cox transformation computed by `boxcox1p` is::
y = ((1+x)**lmbda - 1) / lmbda if lmbda != 0
log(1+x) if lmbda == 0
Returns `nan` if ``x < -1``.
Returns `-inf` if ``x == -1`` and ``lmbda < 0``.
Parameters
----------
x : array_like
Data to be transformed.
lmbda : array_like
Power parameter of the Box-Cox transform.
Returns
-------
y : array
Transformed data.
Notes
-----
.. versionadded:: 0.14.0
Examples
--------
>>> from scipy.special import boxcox1p
>>> boxcox1p(1e-4, [0, 0.5, 1])
array([ 9.99950003e-05, 9.99975001e-05, 1.00000000e-04])
>>> boxcox1p([0.01, 0.1], 0.25)
array([ 0.00996272, 0.09645476])
""")
add_newdoc("scipy.special", "inv_boxcox",
"""
inv_boxcox(y, lmbda)
Compute the inverse of the Box-Cox transformation.
Find ``x`` such that::
y = (x**lmbda - 1) / lmbda if lmbda != 0
log(x) if lmbda == 0
Parameters
----------
y : array_like
Data to be transformed.
lmbda : array_like
Power parameter of the Box-Cox transform.
Returns
-------
x : array
Transformed data.
Notes
-----
.. versionadded:: 0.16.0
Examples
--------
>>> from scipy.special import boxcox, inv_boxcox
>>> y = boxcox([1, 4, 10], 2.5)
>>> inv_boxcox(y, 2.5)
array([1., 4., 10.])
""")
add_newdoc("scipy.special", "inv_boxcox1p",
"""
inv_boxcox1p(y, lmbda)
Compute the inverse of the Box-Cox transformation.
Find ``x`` such that::
y = ((1+x)**lmbda - 1) / lmbda if lmbda != 0
log(1+x) if lmbda == 0
Parameters
----------
y : array_like
Data to be transformed.
lmbda : array_like
Power parameter of the Box-Cox transform.
Returns
-------
x : array
Transformed data.
Notes
-----
.. versionadded:: 0.16.0
Examples
--------
>>> from scipy.special import boxcox1p, inv_boxcox1p
>>> y = boxcox1p([1, 4, 10], 2.5)
>>> inv_boxcox1p(y, 2.5)
array([1., 4., 10.])
""")
add_newdoc("scipy.special", "btdtr",
r"""
btdtr(a, b, x)
Cumulative density function of the beta distribution.
Returns the integral from zero to `x` of the beta probability density
function,
.. math::
I = \int_0^x \frac{\Gamma(a + b)}{\Gamma(a)\Gamma(b)} t^{a-1} (1-t)^{b-1}\,dt
where :math:`\Gamma` is the gamma function.
Parameters
----------
a : array_like
Shape parameter (a > 0).
b : array_like
Shape parameter (b > 0).
x : array_like
Upper limit of integration, in [0, 1].
Returns
-------
I : ndarray
Cumulative density function of the beta distribution with parameters
`a` and `b` at `x`.
See Also
--------
betainc
Notes
-----
This function is identical to the incomplete beta integral function
`betainc`.
Wrapper for the Cephes [1]_ routine `btdtr`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "btdtri",
r"""
btdtri(a, b, p)
The `p`-th quantile of the beta distribution.
This function is the inverse of the beta cumulative distribution function,
`btdtr`, returning the value of `x` for which `btdtr(a, b, x) = p`, or
.. math::
p = \int_0^x \frac{\Gamma(a + b)}{\Gamma(a)\Gamma(b)} t^{a-1} (1-t)^{b-1}\,dt
Parameters
----------
a : array_like
Shape parameter (`a` > 0).
b : array_like
Shape parameter (`b` > 0).
p : array_like
Cumulative probability, in [0, 1].
Returns
-------
x : ndarray
The quantile corresponding to `p`.
See Also
--------
betaincinv
btdtr
Notes
-----
The value of `x` is found by interval halving or Newton iterations.
Wrapper for the Cephes [1]_ routine `incbi`, which solves the equivalent
problem of finding the inverse of the incomplete beta integral.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "cbrt",
"""
cbrt(x)
Element-wise cube root of `x`.
Parameters
----------
x : array_like
`x` must contain real numbers.
Returns
-------
float
The cube root of each value in `x`.
Examples
--------
>>> from scipy.special import cbrt
>>> cbrt(8)
2.0
>>> cbrt([-8, -3, 0.125, 1.331])
array([-2. , -1.44224957, 0.5 , 1.1 ])
""")
add_newdoc("scipy.special", "chdtr",
"""
chdtr(v, x)
Chi square cumulative distribution function
Returns the area under the left hand tail (from 0 to `x`) of the Chi
square probability density function with `v` degrees of freedom::
1/(2**(v/2) * gamma(v/2)) * integral(t**(v/2-1) * exp(-t/2), t=0..x)
""")
add_newdoc("scipy.special", "chdtrc",
"""
chdtrc(v, x)
Chi square survival function
Returns the area under the right hand tail (from `x` to
infinity) of the Chi square probability density function with `v`
degrees of freedom::
1/(2**(v/2) * gamma(v/2)) * integral(t**(v/2-1) * exp(-t/2), t=x..inf)
""")
add_newdoc("scipy.special", "chdtri",
"""
chdtri(v, p)
Inverse to `chdtrc`
Returns the argument x such that ``chdtrc(v, x) == p``.
""")
add_newdoc("scipy.special", "chdtriv",
"""
chdtriv(p, x)
Inverse to `chdtr` vs `v`
Returns the argument v such that ``chdtr(v, x) == p``.
""")
add_newdoc("scipy.special", "chndtr",
"""
chndtr(x, df, nc)
Non-central chi square cumulative distribution function
""")
add_newdoc("scipy.special", "chndtrix",
"""
chndtrix(p, df, nc)
Inverse to `chndtr` vs `x`
""")
add_newdoc("scipy.special", "chndtridf",
"""
chndtridf(x, p, nc)
Inverse to `chndtr` vs `df`
""")
add_newdoc("scipy.special", "chndtrinc",
"""
chndtrinc(x, df, p)
Inverse to `chndtr` vs `nc`
""")
add_newdoc("scipy.special", "cosdg",
"""
cosdg(x)
Cosine of the angle `x` given in degrees.
""")
add_newdoc("scipy.special", "cosm1",
"""
cosm1(x)
cos(x) - 1 for use when `x` is near zero.
""")
add_newdoc("scipy.special", "cotdg",
"""
cotdg(x)
Cotangent of the angle `x` given in degrees.
""")
add_newdoc("scipy.special", "dawsn",
"""
dawsn(x)
Dawson's integral.
Computes::
exp(-x**2) * integral(exp(t**2), t=0..x).
See Also
--------
wofz, erf, erfc, erfcx, erfi
References
----------
.. [1] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-15, 15, num=1000)
>>> plt.plot(x, special.dawsn(x))
>>> plt.xlabel('$x$')
>>> plt.ylabel('$dawsn(x)$')
>>> plt.show()
""")
add_newdoc("scipy.special", "ellipe",
r"""
ellipe(m)
Complete elliptic integral of the second kind
This function is defined as
.. math:: E(m) = \int_0^{\pi/2} [1 - m \sin(t)^2]^{1/2} dt
Parameters
----------
m : array_like
Defines the parameter of the elliptic integral.
Returns
-------
E : ndarray
Value of the elliptic integral.
Notes
-----
Wrapper for the Cephes [1]_ routine `ellpe`.
For `m > 0` the computation uses the approximation,
.. math:: E(m) \approx P(1-m) - (1-m) \log(1-m) Q(1-m),
where :math:`P` and :math:`Q` are tenth-order polynomials. For
`m < 0`, the relation
.. math:: E(m) = E(m/(m - 1)) \sqrt(1-m)
is used.
The parameterization in terms of :math:`m` follows that of section
17.2 in [2]_. Other parameterizations in terms of the
complementary parameter :math:`1 - m`, modular angle
:math:`\sin^2(\alpha) = m`, or modulus :math:`k^2 = m` are also
used, so be careful that you choose the correct parameter.
See Also
--------
ellipkm1 : Complete elliptic integral of the first kind, near `m` = 1
ellipk : Complete elliptic integral of the first kind
ellipkinc : Incomplete elliptic integral of the first kind
ellipeinc : Incomplete elliptic integral of the second kind
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
""")
add_newdoc("scipy.special", "ellipeinc",
r"""
ellipeinc(phi, m)
Incomplete elliptic integral of the second kind
This function is defined as
.. math:: E(\phi, m) = \int_0^{\phi} [1 - m \sin(t)^2]^{1/2} dt
Parameters
----------
phi : array_like
amplitude of the elliptic integral.
m : array_like
parameter of the elliptic integral.
Returns
-------
E : ndarray
Value of the elliptic integral.
Notes
-----
Wrapper for the Cephes [1]_ routine `ellie`.
Computation uses arithmetic-geometric means algorithm.
The parameterization in terms of :math:`m` follows that of section
17.2 in [2]_. Other parameterizations in terms of the
complementary parameter :math:`1 - m`, modular angle
:math:`\sin^2(\alpha) = m`, or modulus :math:`k^2 = m` are also
used, so be careful that you choose the correct parameter.
See Also
--------
ellipkm1 : Complete elliptic integral of the first kind, near `m` = 1
ellipk : Complete elliptic integral of the first kind
ellipkinc : Incomplete elliptic integral of the first kind
ellipe : Complete elliptic integral of the second kind
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
""")
add_newdoc("scipy.special", "ellipj",
"""
ellipj(u, m)
Jacobian elliptic functions
Calculates the Jacobian elliptic functions of parameter `m` between
0 and 1, and real argument `u`.
Parameters
----------
m : array_like
Parameter.
u : array_like
Argument.
Returns
-------
sn, cn, dn, ph : ndarrays
The returned functions::
sn(u|m), cn(u|m), dn(u|m)
The value `ph` is such that if `u = ellipk(ph, m)`,
then `sn(u|m) = sin(ph)` and `cn(u|m) = cos(ph)`.
Notes
-----
Wrapper for the Cephes [1]_ routine `ellpj`.
These functions are periodic, with quarter-period on the real axis
equal to the complete elliptic integral `ellipk(m)`.
Relation to incomplete elliptic integral: If `u = ellipk(phi,m)`, then
`sn(u|m) = sin(phi)`, and `cn(u|m) = cos(phi)`. The `phi` is called
the amplitude of `u`.
Computation is by means of the arithmetic-geometric mean algorithm,
except when `m` is within 1e-9 of 0 or 1. In the latter case with `m`
close to 1, the approximation applies only for `phi < pi/2`.
See also
--------
ellipk : Complete elliptic integral of the first kind.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "ellipkm1",
"""
ellipkm1(p)
Complete elliptic integral of the first kind around `m` = 1
This function is defined as
.. math:: K(p) = \\int_0^{\\pi/2} [1 - m \\sin(t)^2]^{-1/2} dt
where `m = 1 - p`.
Parameters
----------
p : array_like
Defines the parameter of the elliptic integral as `m = 1 - p`.
Returns
-------
K : ndarray
Value of the elliptic integral.
Notes
-----
Wrapper for the Cephes [1]_ routine `ellpk`.
For `p <= 1`, computation uses the approximation,
.. math:: K(p) \\approx P(p) - \\log(p) Q(p),
where :math:`P` and :math:`Q` are tenth-order polynomials. The
argument `p` is used internally rather than `m` so that the logarithmic
singularity at `m = 1` will be shifted to the origin; this preserves
maximum accuracy. For `p > 1`, the identity
.. math:: K(p) = K(1/p)/\\sqrt(p)
is used.
See Also
--------
ellipk : Complete elliptic integral of the first kind
ellipkinc : Incomplete elliptic integral of the first kind
ellipe : Complete elliptic integral of the second kind
ellipeinc : Incomplete elliptic integral of the second kind
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "ellipkinc",
r"""
ellipkinc(phi, m)
Incomplete elliptic integral of the first kind
This function is defined as
.. math:: K(\phi, m) = \int_0^{\phi} [1 - m \sin(t)^2]^{-1/2} dt
This function is also called `F(phi, m)`.
Parameters
----------
phi : array_like
amplitude of the elliptic integral
m : array_like
parameter of the elliptic integral
Returns
-------
K : ndarray
Value of the elliptic integral
Notes
-----
Wrapper for the Cephes [1]_ routine `ellik`. The computation is
carried out using the arithmetic-geometric mean algorithm.
The parameterization in terms of :math:`m` follows that of section
17.2 in [2]_. Other parameterizations in terms of the
complementary parameter :math:`1 - m`, modular angle
:math:`\sin^2(\alpha) = m`, or modulus :math:`k^2 = m` are also
used, so be careful that you choose the correct parameter.
See Also
--------
ellipkm1 : Complete elliptic integral of the first kind, near `m` = 1
ellipk : Complete elliptic integral of the first kind
ellipe : Complete elliptic integral of the second kind
ellipeinc : Incomplete elliptic integral of the second kind
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
""")
add_newdoc("scipy.special", "entr",
r"""
entr(x)
Elementwise function for computing entropy.
.. math:: \text{entr}(x) = \begin{cases} - x \log(x) & x > 0 \\ 0 & x = 0 \\ -\infty & \text{otherwise} \end{cases}
Parameters
----------
x : ndarray
Input array.
Returns
-------
res : ndarray
The value of the elementwise entropy function at the given points `x`.
See Also
--------
kl_div, rel_entr
Notes
-----
This function is concave.
.. versionadded:: 0.15.0
""")
add_newdoc("scipy.special", "erf",
"""
erf(z)
Returns the error function of complex argument.
It is defined as ``2/sqrt(pi)*integral(exp(-t**2), t=0..z)``.
Parameters
----------
x : ndarray
Input array.
Returns
-------
res : ndarray
The values of the error function at the given points `x`.
See Also
--------
erfc, erfinv, erfcinv, wofz, erfcx, erfi
Notes
-----
The cumulative of the unit normal distribution is given by
``Phi(z) = 1/2[1 + erf(z/sqrt(2))]``.
References
----------
.. [1] http://en.wikipedia.org/wiki/Error_function
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover,
1972. http://www.math.sfu.ca/~cbm/aands/page_297.htm
.. [3] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-3, 3)
>>> plt.plot(x, special.erf(x))
>>> plt.xlabel('$x$')
>>> plt.ylabel('$erf(x)$')
>>> plt.show()
""")
add_newdoc("scipy.special", "erfc",
"""
erfc(x)
Complementary error function, ``1 - erf(x)``.
See Also
--------
erf, erfi, erfcx, dawsn, wofz
References
----------
.. [1] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-3, 3)
>>> plt.plot(x, special.erfc(x))
>>> plt.xlabel('$x$')
>>> plt.ylabel('$erfc(x)$')
>>> plt.show()
""")
add_newdoc("scipy.special", "erfi",
"""
erfi(z)
Imaginary error function, ``-i erf(i z)``.
See Also
--------
erf, erfc, erfcx, dawsn, wofz
Notes
-----
.. versionadded:: 0.12.0
References
----------
.. [1] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-3, 3)
>>> plt.plot(x, special.erfi(x))
>>> plt.xlabel('$x$')
>>> plt.ylabel('$erfi(x)$')
>>> plt.show()
""")
add_newdoc("scipy.special", "erfcx",
"""
erfcx(x)
Scaled complementary error function, ``exp(x**2) * erfc(x)``.
See Also
--------
erf, erfc, erfi, dawsn, wofz
Notes
-----
.. versionadded:: 0.12.0
References
----------
.. [1] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-3, 3)
>>> plt.plot(x, special.erfcx(x))
>>> plt.xlabel('$x$')
>>> plt.ylabel('$erfcx(x)$')
>>> plt.show()
""")
add_newdoc("scipy.special", "eval_jacobi",
r"""
eval_jacobi(n, alpha, beta, x, out=None)
Evaluate Jacobi polynomial at a point.
The Jacobi polynomials can be defined via the Gauss hypergeometric
function :math:`{}_2F_1` as
.. math::
P_n^{(\alpha, \beta)}(x) = \frac{(\alpha + 1)_n}{\Gamma(n + 1)}
{}_2F_1(-n, 1 + \alpha + \beta + n; \alpha + 1; (1 - z)/2)
where :math:`(\cdot)_n` is the Pochhammer symbol; see `poch`. When
:math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer the result is
determined via the relation to the Gauss hypergeometric
function.
alpha : array_like
Parameter
beta : array_like
Parameter
x : array_like
Points at which to evaluate the polynomial
Returns
-------
P : ndarray
Values of the Jacobi polynomial
See Also
--------
roots_jacobi : roots and quadrature weights of Jacobi polynomials
jacobi : Jacobi polynomial object
hyp2f1 : Gauss hypergeometric function
""")
add_newdoc("scipy.special", "eval_sh_jacobi",
r"""
eval_sh_jacobi(n, p, q, x, out=None)
Evaluate shifted Jacobi polynomial at a point.
Defined by
.. math::
G_n^{(p, q)}(x)
= \binom{2n + p - 1}{n}^{-1} P_n^{(p - q, q - 1)}(2x - 1),
where :math:`P_n^{(\cdot, \cdot)}` is the n-th Jacobi polynomial.
Parameters
----------
n : int
Degree of the polynomial. If not an integer, the result is
determined via the relation to `binom` and `eval_jacobi`.
p : float
Parameter
q : float
Parameter
Returns
-------
G : ndarray
Values of the shifted Jacobi polynomial.
See Also
--------
roots_sh_jacobi : roots and quadrature weights of shifted Jacobi
polynomials
sh_jacobi : shifted Jacobi polynomial object
eval_jacobi : evaluate Jacobi polynomials
""")
add_newdoc("scipy.special", "eval_gegenbauer",
r"""
eval_gegenbauer(n, alpha, x, out=None)
Evaluate Gegenbauer polynomial at a point.
The Gegenbauer polynomials can be defined via the Gauss
hypergeometric function :math:`{}_2F_1` as
.. math::
C_n^{(\alpha)} = \frac{(2\alpha)_n}{\Gamma(n + 1)}
{}_2F_1(-n, 2\alpha + n; \alpha + 1/2; (1 - z)/2).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to the Gauss hypergeometric
function.
alpha : array_like
Parameter
x : array_like
Points at which to evaluate the Gegenbauer polynomial
Returns
-------
C : ndarray
Values of the Gegenbauer polynomial
See Also
--------
roots_gegenbauer : roots and quadrature weights of Gegenbauer
polynomials
gegenbauer : Gegenbauer polynomial object
hyp2f1 : Gauss hypergeometric function
""")
add_newdoc("scipy.special", "eval_chebyt",
r"""
eval_chebyt(n, x, out=None)
Evaluate Chebyshev polynomial of the first kind at a point.
The Chebyshev polynomials of the first kind can be defined via the
Gauss hypergeometric function :math:`{}_2F_1` as
.. math::
T_n(x) = {}_2F_1(n, -n; 1/2; (1 - x)/2).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to the Gauss hypergeometric
function.
x : array_like
Points at which to evaluate the Chebyshev polynomial
Returns
-------
T : ndarray
Values of the Chebyshev polynomial
See Also
--------
roots_chebyt : roots and quadrature weights of Chebyshev
polynomials of the first kind
chebyu : Chebychev polynomial object
eval_chebyu : evaluate Chebyshev polynomials of the second kind
hyp2f1 : Gauss hypergeometric function
numpy.polynomial.chebyshev.Chebyshev : Chebyshev series
Notes
-----
This routine is numerically stable for `x` in ``[-1, 1]`` at least
up to order ``10000``.
""")
add_newdoc("scipy.special", "eval_chebyu",
r"""
eval_chebyu(n, x, out=None)
Evaluate Chebyshev polynomial of the second kind at a point.
The Chebyshev polynomials of the second kind can be defined via
the Gauss hypergeometric function :math:`{}_2F_1` as
.. math::
U_n(x) = (n + 1) {}_2F_1(-n, n + 2; 3/2; (1 - x)/2).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to the Gauss hypergeometric
function.
x : array_like
Points at which to evaluate the Chebyshev polynomial
Returns
-------
U : ndarray
Values of the Chebyshev polynomial
See Also
--------
roots_chebyu : roots and quadrature weights of Chebyshev
polynomials of the second kind
chebyu : Chebyshev polynomial object
eval_chebyt : evaluate Chebyshev polynomials of the first kind
hyp2f1 : Gauss hypergeometric function
""")
add_newdoc("scipy.special", "eval_chebys",
r"""
eval_chebys(n, x, out=None)
Evaluate Chebyshev polynomial of the second kind on [-2, 2] at a
point.
These polynomials are defined as
.. math::
S_n(x) = U_n(x/2)
where :math:`U_n` is a Chebyshev polynomial of the second kind.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to `eval_chebyu`.
x : array_like
Points at which to evaluate the Chebyshev polynomial
Returns
-------
S : ndarray
Values of the Chebyshev polynomial
See Also
--------
roots_chebys : roots and quadrature weights of Chebyshev
polynomials of the second kind on [-2, 2]
chebys : Chebyshev polynomial object
eval_chebyu : evaluate Chebyshev polynomials of the second kind
""")
add_newdoc("scipy.special", "eval_chebyc",
r"""
eval_chebyc(n, x, out=None)
Evaluate Chebyshev polynomial of the first kind on [-2, 2] at a
point.
These polynomials are defined as
.. math::
S_n(x) = T_n(x/2)
where :math:`T_n` is a Chebyshev polynomial of the first kind.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to `eval_chebyt`.
x : array_like
Points at which to evaluate the Chebyshev polynomial
Returns
-------
C : ndarray
Values of the Chebyshev polynomial
See Also
--------
roots_chebyc : roots and quadrature weights of Chebyshev
polynomials of the first kind on [-2, 2]
chebyc : Chebyshev polynomial object
numpy.polynomial.chebyshev.Chebyshev : Chebyshev series
eval_chebyt : evaluate Chebycshev polynomials of the first kind
""")
add_newdoc("scipy.special", "eval_sh_chebyt",
r"""
eval_sh_chebyt(n, x, out=None)
Evaluate shifted Chebyshev polynomial of the first kind at a
point.
These polynomials are defined as
.. math::
T_n^*(x) = T_n(2x - 1)
where :math:`T_n` is a Chebyshev polynomial of the first kind.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to `eval_chebyt`.
x : array_like
Points at which to evaluate the shifted Chebyshev polynomial
Returns
-------
T : ndarray
Values of the shifted Chebyshev polynomial
See Also
--------
roots_sh_chebyt : roots and quadrature weights of shifted
Chebyshev polynomials of the first kind
sh_chebyt : shifted Chebyshev polynomial object
eval_chebyt : evaluate Chebyshev polynomials of the first kind
numpy.polynomial.chebyshev.Chebyshev : Chebyshev series
""")
add_newdoc("scipy.special", "eval_sh_chebyu",
r"""
eval_sh_chebyu(n, x, out=None)
Evaluate shifted Chebyshev polynomial of the second kind at a
point.
These polynomials are defined as
.. math::
U_n^*(x) = U_n(2x - 1)
where :math:`U_n` is a Chebyshev polynomial of the first kind.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to `eval_chebyu`.
x : array_like
Points at which to evaluate the shifted Chebyshev polynomial
Returns
-------
U : ndarray
Values of the shifted Chebyshev polynomial
See Also
--------
roots_sh_chebyu : roots and quadrature weights of shifted
Chebychev polynomials of the second kind
sh_chebyu : shifted Chebyshev polynomial object
eval_chebyu : evaluate Chebyshev polynomials of the second kind
""")
add_newdoc("scipy.special", "eval_legendre",
r"""
eval_legendre(n, x, out=None)
Evaluate Legendre polynomial at a point.
The Legendre polynomials can be defined via the Gauss
hypergeometric function :math:`{}_2F_1` as
.. math::
P_n(x) = {}_2F_1(-n, n + 1; 1; (1 - x)/2).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the result is
determined via the relation to the Gauss hypergeometric
function.
x : array_like
Points at which to evaluate the Legendre polynomial
Returns
-------
P : ndarray
Values of the Legendre polynomial
See Also
--------
roots_legendre : roots and quadrature weights of Legendre
polynomials
legendre : Legendre polynomial object
hyp2f1 : Gauss hypergeometric function
numpy.polynomial.legendre.Legendre : Legendre series
""")
add_newdoc("scipy.special", "eval_sh_legendre",
r"""
eval_sh_legendre(n, x, out=None)
Evaluate shifted Legendre polynomial at a point.
These polynomials are defined as
.. math::
P_n^*(x) = P_n(2x - 1)
where :math:`P_n` is a Legendre polynomial.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer, the value is
determined via the relation to `eval_legendre`.
x : array_like
Points at which to evaluate the shifted Legendre polynomial
Returns
-------
P : ndarray
Values of the shifted Legendre polynomial
See Also
--------
roots_sh_legendre : roots and quadrature weights of shifted
Legendre polynomials
sh_legendre : shifted Legendre polynomial object
eval_legendre : evaluate Legendre polynomials
numpy.polynomial.legendre.Legendre : Legendre series
""")
add_newdoc("scipy.special", "eval_genlaguerre",
r"""
eval_genlaguerre(n, alpha, x, out=None)
Evaluate generalized Laguerre polynomial at a point.
The generalized Laguerre polynomials can be defined via the
confluent hypergeometric function :math:`{}_1F_1` as
.. math::
L_n^{(\alpha)}(x) = \binom{n + \alpha}{n}
{}_1F_1(-n, \alpha + 1, x).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`. The Laguerre polynomials are the special case where
:math:`\alpha = 0`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer the result is
determined via the relation to the confluent hypergeometric
function.
alpha : array_like
Parameter; must have ``alpha > -1``
x : array_like
Points at which to evaluate the generalized Laguerre
polynomial
Returns
-------
L : ndarray
Values of the generalized Laguerre polynomial
See Also
--------
roots_genlaguerre : roots and quadrature weights of generalized
Laguerre polynomials
genlaguerre : generalized Laguerre polynomial object
hyp1f1 : confluent hypergeometric function
eval_laguerre : evaluate Laguerre polynomials
""")
add_newdoc("scipy.special", "eval_laguerre",
r"""
eval_laguerre(n, x, out=None)
Evaluate Laguerre polynomial at a point.
The Laguerre polynomials can be defined via the confluent
hypergeometric function :math:`{}_1F_1` as
.. math::
L_n(x) = {}_1F_1(-n, 1, x).
When :math:`n` is an integer the result is a polynomial of degree
:math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial. If not an integer the result is
determined via the relation to the confluent hypergeometric
function.
x : array_like
Points at which to evaluate the Laguerre polynomial
Returns
-------
L : ndarray
Values of the Laguerre polynomial
See Also
--------
roots_laguerre : roots and quadrature weights of Laguerre
polynomials
laguerre : Laguerre polynomial object
numpy.polynomial.laguerre.Laguerre : Laguerre series
eval_genlaguerre : evaluate generalized Laguerre polynomials
""")
add_newdoc("scipy.special", "eval_hermite",
r"""
eval_hermite(n, x, out=None)
Evaluate physicist's Hermite polynomial at a point.
Defined by
.. math::
H_n(x) = (-1)^n e^{x^2} \frac{d^n}{dx^n} e^{-x^2};
:math:`H_n` is a polynomial of degree :math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial
x : array_like
Points at which to evaluate the Hermite polynomial
Returns
-------
H : ndarray
Values of the Hermite polynomial
See Also
--------
roots_hermite : roots and quadrature weights of physicist's
Hermite polynomials
hermite : physicist's Hermite polynomial object
numpy.polynomial.hermite.Hermite : Physicist's Hermite series
eval_hermitenorm : evaluate Probabilist's Hermite polynomials
""")
add_newdoc("scipy.special", "eval_hermitenorm",
r"""
eval_hermitenorm(n, x, out=None)
Evaluate probabilist's (normalized) Hermite polynomial at a
point.
Defined by
.. math::
He_n(x) = (-1)^n e^{x^2/2} \frac{d^n}{dx^n} e^{-x^2/2};
:math:`He_n` is a polynomial of degree :math:`n`.
Parameters
----------
n : array_like
Degree of the polynomial
x : array_like
Points at which to evaluate the Hermite polynomial
Returns
-------
He : ndarray
Values of the Hermite polynomial
See Also
--------
roots_hermitenorm : roots and quadrature weights of probabilist's
Hermite polynomials
hermitenorm : probabilist's Hermite polynomial object
numpy.polynomial.hermite_e.HermiteE : Probabilist's Hermite series
eval_hermite : evaluate physicist's Hermite polynomials
""")
add_newdoc("scipy.special", "exp1",
"""
exp1(z)
Exponential integral E_1 of complex argument z
::
integral(exp(-z*t)/t, t=1..inf).
""")
add_newdoc("scipy.special", "exp10",
"""
exp10(x)
Compute ``10**x`` element-wise.
Parameters
----------
x : array_like
`x` must contain real numbers.
Returns
-------
float
``10**x``, computed element-wise.
Examples
--------
>>> from scipy.special import exp10
>>> exp10(3)
1000.0
>>> x = np.array([[-1, -0.5, 0], [0.5, 1, 1.5]])
>>> exp10(x)
array([[ 0.1 , 0.31622777, 1. ],
[ 3.16227766, 10. , 31.6227766 ]])
""")
add_newdoc("scipy.special", "exp2",
"""
exp2(x)
Compute ``2**x`` element-wise.
Parameters
----------
x : array_like
`x` must contain real numbers.
Returns
-------
float
``2**x``, computed element-wise.
Examples
--------
>>> from scipy.special import exp2
>>> exp2(3)
8.0
>>> x = np.array([[-1, -0.5, 0], [0.5, 1, 1.5]])
>>> exp2(x)
array([[ 0.5 , 0.70710678, 1. ],
[ 1.41421356, 2. , 2.82842712]])
""")
add_newdoc("scipy.special", "expi",
"""
expi(x)
Exponential integral Ei
Defined as::
integral(exp(t)/t, t=-inf..x)
See `expn` for a different exponential integral.
""")
add_newdoc('scipy.special', 'expit',
"""
expit(x)
Expit ufunc for ndarrays.
The expit function, also known as the logistic function, is defined as
expit(x) = 1/(1+exp(-x)). It is the inverse of the logit function.
Parameters
----------
x : ndarray
The ndarray to apply expit to element-wise.
Returns
-------
out : ndarray
An ndarray of the same shape as x. Its entries
are expit of the corresponding entry of x.
See Also
--------
logit
Notes
-----
As a ufunc expit takes a number of optional
keyword arguments. For more information
see `ufuncs <https://docs.scipy.org/doc/numpy/reference/ufuncs.html>`_
.. versionadded:: 0.10.0
Examples
--------
>>> from scipy.special import expit, logit
>>> expit([-np.inf, -1.5, 0, 1.5, np.inf])
array([ 0. , 0.18242552, 0.5 , 0.81757448, 1. ])
`logit` is the inverse of `expit`:
>>> logit(expit([-2.5, 0, 3.1, 5.0]))
array([-2.5, 0. , 3.1, 5. ])
Plot expit(x) for x in [-6, 6]:
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-6, 6, 121)
>>> y = expit(x)
>>> plt.plot(x, y)
>>> plt.grid()
>>> plt.xlim(-6, 6)
>>> plt.xlabel('x')
>>> plt.title('expit(x)')
>>> plt.show()
""")
add_newdoc("scipy.special", "expm1",
"""
expm1(x)
Compute ``exp(x) - 1``.
When `x` is near zero, ``exp(x)`` is near 1, so the numerical calculation
of ``exp(x) - 1`` can suffer from catastrophic loss of precision.
``expm1(x)`` is implemented to avoid the loss of precision that occurs when
`x` is near zero.
Parameters
----------
x : array_like
`x` must contain real numbers.
Returns
-------
float
``exp(x) - 1`` computed element-wise.
Examples
--------
>>> from scipy.special import expm1
>>> expm1(1.0)
1.7182818284590451
>>> expm1([-0.2, -0.1, 0, 0.1, 0.2])
array([-0.18126925, -0.09516258, 0. , 0.10517092, 0.22140276])
The exact value of ``exp(7.5e-13) - 1`` is::
7.5000000000028125000000007031250000001318...*10**-13.
Here is what ``expm1(7.5e-13)`` gives:
>>> expm1(7.5e-13)
7.5000000000028135e-13
Compare that to ``exp(7.5e-13) - 1``, where the subtraction results in
a "catastrophic" loss of precision:
>>> np.exp(7.5e-13) - 1
7.5006667543675576e-13
""")
add_newdoc("scipy.special", "expn",
"""
expn(n, x)
Exponential integral E_n
Returns the exponential integral for integer `n` and non-negative `x` and
`n`::
integral(exp(-x*t) / t**n, t=1..inf).
""")
add_newdoc("scipy.special", "exprel",
r"""
exprel(x)
Relative error exponential, ``(exp(x) - 1)/x``.
When `x` is near zero, ``exp(x)`` is near 1, so the numerical calculation
of ``exp(x) - 1`` can suffer from catastrophic loss of precision.
``exprel(x)`` is implemented to avoid the loss of precision that occurs when
`x` is near zero.
Parameters
----------
x : ndarray
Input array. `x` must contain real numbers.
Returns
-------
float
``(exp(x) - 1)/x``, computed element-wise.
See Also
--------
expm1
Notes
-----
.. versionadded:: 0.17.0
Examples
--------
>>> from scipy.special import exprel
>>> exprel(0.01)
1.0050167084168056
>>> exprel([-0.25, -0.1, 0, 0.1, 0.25])
array([ 0.88479687, 0.95162582, 1. , 1.05170918, 1.13610167])
Compare ``exprel(5e-9)`` to the naive calculation. The exact value
is ``1.00000000250000000416...``.
>>> exprel(5e-9)
1.0000000025
>>> (np.exp(5e-9) - 1)/5e-9
0.99999999392252903
""")
add_newdoc("scipy.special", "fdtr",
r"""
fdtr(dfn, dfd, x)
F cumulative distribution function.
Returns the value of the cumulative density function of the
F-distribution, also known as Snedecor's F-distribution or the
Fisher-Snedecor distribution.
The F-distribution with parameters :math:`d_n` and :math:`d_d` is the
distribution of the random variable,
.. math::
X = \frac{U_n/d_n}{U_d/d_d},
where :math:`U_n` and :math:`U_d` are random variables distributed
:math:`\chi^2`, with :math:`d_n` and :math:`d_d` degrees of freedom,
respectively.
Parameters
----------
dfn : array_like
First parameter (positive float).
dfd : array_like
Second parameter (positive float).
x : array_like
Argument (nonnegative float).
Returns
-------
y : ndarray
The CDF of the F-distribution with parameters `dfn` and `dfd` at `x`.
Notes
-----
The regularized incomplete beta function is used, according to the
formula,
.. math::
F(d_n, d_d; x) = I_{xd_n/(d_d + xd_n)}(d_n/2, d_d/2).
Wrapper for the Cephes [1]_ routine `fdtr`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "fdtrc",
r"""
fdtrc(dfn, dfd, x)
F survival function.
Returns the complemented F-distribution function (the integral of the
density from `x` to infinity).
Parameters
----------
dfn : array_like
First parameter (positive float).
dfd : array_like
Second parameter (positive float).
x : array_like
Argument (nonnegative float).
Returns
-------
y : ndarray
The complemented F-distribution function with parameters `dfn` and
`dfd` at `x`.
See also
--------
fdtr
Notes
-----
The regularized incomplete beta function is used, according to the
formula,
.. math::
F(d_n, d_d; x) = I_{d_d/(d_d + xd_n)}(d_d/2, d_n/2).
Wrapper for the Cephes [1]_ routine `fdtrc`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "fdtri",
r"""
fdtri(dfn, dfd, p)
The `p`-th quantile of the F-distribution.
This function is the inverse of the F-distribution CDF, `fdtr`, returning
the `x` such that `fdtr(dfn, dfd, x) = p`.
Parameters
----------
dfn : array_like
First parameter (positive float).
dfd : array_like
Second parameter (positive float).
p : array_like
Cumulative probability, in [0, 1].
Returns
-------
x : ndarray
The quantile corresponding to `p`.
Notes
-----
The computation is carried out using the relation to the inverse
regularized beta function, :math:`I^{-1}_x(a, b)`. Let
:math:`z = I^{-1}_p(d_d/2, d_n/2).` Then,
.. math::
x = \frac{d_d (1 - z)}{d_n z}.
If `p` is such that :math:`x < 0.5`, the following relation is used
instead for improved stability: let
:math:`z' = I^{-1}_{1 - p}(d_n/2, d_d/2).` Then,
.. math::
x = \frac{d_d z'}{d_n (1 - z')}.
Wrapper for the Cephes [1]_ routine `fdtri`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "fdtridfd",
"""
fdtridfd(dfn, p, x)
Inverse to `fdtr` vs dfd
Finds the F density argument dfd such that ``fdtr(dfn, dfd, x) == p``.
""")
add_newdoc("scipy.special", "fdtridfn",
"""
fdtridfn(p, dfd, x)
Inverse to `fdtr` vs dfn
finds the F density argument dfn such that ``fdtr(dfn, dfd, x) == p``.
""")
add_newdoc("scipy.special", "fresnel",
"""
fresnel(z)
Fresnel sin and cos integrals
Defined as::
ssa = integral(sin(pi/2 * t**2), t=0..z)
csa = integral(cos(pi/2 * t**2), t=0..z)
Parameters
----------
z : float or complex array_like
Argument
Returns
-------
ssa, csa
Fresnel sin and cos integral values
""")
add_newdoc("scipy.special", "gamma",
r"""
gamma(z)
Gamma function.
.. math::
\Gamma(z) = \int_0^\infty x^{z-1} e^{-x} dx = (z - 1)!
The gamma function is often referred to as the generalized
factorial since ``z*gamma(z) = gamma(z+1)`` and ``gamma(n+1) =
n!`` for natural number *n*.
Parameters
----------
z : float or complex array_like
Returns
-------
float or complex
The value(s) of gamma(z)
Examples
--------
>>> from scipy.special import gamma, factorial
>>> gamma([0, 0.5, 1, 5])
array([ inf, 1.77245385, 1. , 24. ])
>>> z = 2.5 + 1j
>>> gamma(z)
(0.77476210455108352+0.70763120437959293j)
>>> gamma(z+1), z*gamma(z) # Recurrence property
((1.2292740569981171+2.5438401155000685j),
(1.2292740569981158+2.5438401155000658j))
>>> gamma(0.5)**2 # gamma(0.5) = sqrt(pi)
3.1415926535897927
Plot gamma(x) for real x
>>> x = np.linspace(-3.5, 5.5, 2251)
>>> y = gamma(x)
>>> import matplotlib.pyplot as plt
>>> plt.plot(x, y, 'b', alpha=0.6, label='gamma(x)')
>>> k = np.arange(1, 7)
>>> plt.plot(k, factorial(k-1), 'k*', alpha=0.6,
... label='(x-1)!, x = 1, 2, ...')
>>> plt.xlim(-3.5, 5.5)
>>> plt.ylim(-10, 25)
>>> plt.grid()
>>> plt.xlabel('x')
>>> plt.legend(loc='lower right')
>>> plt.show()
""")
add_newdoc("scipy.special", "gammainc",
r"""
gammainc(a, x)
Regularized lower incomplete gamma function.
Defined as
.. math::
\frac{1}{\Gamma(a)} \int_0^x t^{a - 1}e^{-t} dt
for :math:`a > 0` and :math:`x \geq 0`. The function satisfies the
relation ``gammainc(a, x) + gammaincc(a, x) = 1`` where
`gammaincc` is the regularized upper incomplete gamma function.
Notes
-----
The implementation largely follows that of [1]_.
See also
--------
gammaincc : regularized upper incomplete gamma function
gammaincinv : inverse to ``gammainc`` versus ``x``
gammainccinv : inverse to ``gammaincc`` versus ``x``
References
----------
.. [1] Maddock et. al., "Incomplete Gamma Functions",
http://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/sf_gamma/igamma.html
""")
add_newdoc("scipy.special", "gammaincc",
r"""
gammaincc(a, x)
Regularized upper incomplete gamma function.
Defined as
.. math::
\frac{1}{\Gamma(a)} \int_x^\infty t^{a - 1}e^{-t} dt
for :math:`a > 0` and :math:`x \geq 0`. The function satisfies the
relation ``gammainc(a, x) + gammaincc(a, x) = 1`` where `gammainc`
is the regularized lower incomplete gamma function.
Notes
-----
The implementation largely follows that of [1]_.
See also
--------
gammainc : regularized lower incomplete gamma function
gammaincinv : inverse to ``gammainc`` versus ``x``
gammainccinv : inverse to ``gammaincc`` versus ``x``
References
----------
.. [1] Maddock et. al., "Incomplete Gamma Functions",
http://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/sf_gamma/igamma.html
""")
add_newdoc("scipy.special", "gammainccinv",
"""
gammainccinv(a, y)
Inverse to `gammaincc`
Returns `x` such that ``gammaincc(a, x) == y``.
""")
add_newdoc("scipy.special", "gammaincinv",
"""
gammaincinv(a, y)
Inverse to `gammainc`
Returns `x` such that ``gammainc(a, x) = y``.
""")
add_newdoc("scipy.special", "gammaln",
"""
Logarithm of the absolute value of the Gamma function.
Parameters
----------
x : array-like
Values on the real line at which to compute ``gammaln``
Returns
-------
gammaln : ndarray
Values of ``gammaln`` at x.
See Also
--------
gammasgn : sign of the gamma function
loggamma : principal branch of the logarithm of the gamma function
Notes
-----
When used in conjunction with `gammasgn`, this function is useful
for working in logspace on the real axis without having to deal with
complex numbers, via the relation ``exp(gammaln(x)) = gammasgn(x)*gamma(x)``.
For complex-valued log-gamma, use `loggamma` instead of `gammaln`.
""")
add_newdoc("scipy.special", "gammasgn",
"""
gammasgn(x)
Sign of the gamma function.
See Also
--------
gammaln
loggamma
""")
add_newdoc("scipy.special", "gdtr",
r"""
gdtr(a, b, x)
Gamma distribution cumulative density function.
Returns the integral from zero to `x` of the gamma probability density
function,
.. math::
F = \int_0^x \frac{a^b}{\Gamma(b)} t^{b-1} e^{-at}\,dt,
where :math:`\Gamma` is the gamma function.
Parameters
----------
a : array_like
The rate parameter of the gamma distribution, sometimes denoted
:math:`\beta` (float). It is also the reciprocal of the scale
parameter :math:`\theta`.
b : array_like
The shape parameter of the gamma distribution, sometimes denoted
:math:`\alpha` (float).
x : array_like
The quantile (upper limit of integration; float).
See also
--------
gdtrc : 1 - CDF of the gamma distribution.
Returns
-------
F : ndarray
The CDF of the gamma distribution with parameters `a` and `b`
evaluated at `x`.
Notes
-----
The evaluation is carried out using the relation to the incomplete gamma
integral (regularized gamma function).
Wrapper for the Cephes [1]_ routine `gdtr`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "gdtrc",
r"""
gdtrc(a, b, x)
Gamma distribution survival function.
Integral from `x` to infinity of the gamma probability density function,
.. math::
F = \int_x^\infty \frac{a^b}{\Gamma(b)} t^{b-1} e^{-at}\,dt,
where :math:`\Gamma` is the gamma function.
Parameters
----------
a : array_like
The rate parameter of the gamma distribution, sometimes denoted
:math:`\beta` (float). It is also the reciprocal of the scale
parameter :math:`\theta`.
b : array_like
The shape parameter of the gamma distribution, sometimes denoted
:math:`\alpha` (float).
x : array_like
The quantile (lower limit of integration; float).
Returns
-------
F : ndarray
The survival function of the gamma distribution with parameters `a`
and `b` evaluated at `x`.
See Also
--------
gdtr, gdtri
Notes
-----
The evaluation is carried out using the relation to the incomplete gamma
integral (regularized gamma function).
Wrapper for the Cephes [1]_ routine `gdtrc`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "gdtria",
"""
gdtria(p, b, x, out=None)
Inverse of `gdtr` vs a.
Returns the inverse with respect to the parameter `a` of ``p =
gdtr(a, b, x)``, the cumulative distribution function of the gamma
distribution.
Parameters
----------
p : array_like
Probability values.
b : array_like
`b` parameter values of `gdtr(a, b, x)`. `b` is the "shape" parameter
of the gamma distribution.
x : array_like
Nonnegative real values, from the domain of the gamma distribution.
out : ndarray, optional
If a fourth argument is given, it must be a numpy.ndarray whose size
matches the broadcast result of `a`, `b` and `x`. `out` is then the
array returned by the function.
Returns
-------
a : ndarray
Values of the `a` parameter such that `p = gdtr(a, b, x)`. `1/a`
is the "scale" parameter of the gamma distribution.
See Also
--------
gdtr : CDF of the gamma distribution.
gdtrib : Inverse with respect to `b` of `gdtr(a, b, x)`.
gdtrix : Inverse with respect to `x` of `gdtr(a, b, x)`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfgam`.
The cumulative distribution function `p` is computed using a routine by
DiDinato and Morris [2]_. Computation of `a` involves a search for a value
that produces the desired value of `p`. The search relies on the
monotonicity of `p` with `a`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] DiDinato, A. R. and Morris, A. H.,
Computation of the incomplete gamma function ratios and their
inverse. ACM Trans. Math. Softw. 12 (1986), 377-393.
Examples
--------
First evaluate `gdtr`.
>>> from scipy.special import gdtr, gdtria
>>> p = gdtr(1.2, 3.4, 5.6)
>>> print(p)
0.94378087442
Verify the inverse.
>>> gdtria(p, 3.4, 5.6)
1.2
""")
add_newdoc("scipy.special", "gdtrib",
"""
gdtrib(a, p, x, out=None)
Inverse of `gdtr` vs b.
Returns the inverse with respect to the parameter `b` of ``p =
gdtr(a, b, x)``, the cumulative distribution function of the gamma
distribution.
Parameters
----------
a : array_like
`a` parameter values of `gdtr(a, b, x)`. `1/a` is the "scale"
parameter of the gamma distribution.
p : array_like
Probability values.
x : array_like
Nonnegative real values, from the domain of the gamma distribution.
out : ndarray, optional
If a fourth argument is given, it must be a numpy.ndarray whose size
matches the broadcast result of `a`, `b` and `x`. `out` is then the
array returned by the function.
Returns
-------
b : ndarray
Values of the `b` parameter such that `p = gdtr(a, b, x)`. `b` is
the "shape" parameter of the gamma distribution.
See Also
--------
gdtr : CDF of the gamma distribution.
gdtria : Inverse with respect to `a` of `gdtr(a, b, x)`.
gdtrix : Inverse with respect to `x` of `gdtr(a, b, x)`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfgam`.
The cumulative distribution function `p` is computed using a routine by
DiDinato and Morris [2]_. Computation of `b` involves a search for a value
that produces the desired value of `p`. The search relies on the
monotonicity of `p` with `b`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] DiDinato, A. R. and Morris, A. H.,
Computation of the incomplete gamma function ratios and their
inverse. ACM Trans. Math. Softw. 12 (1986), 377-393.
Examples
--------
First evaluate `gdtr`.
>>> from scipy.special import gdtr, gdtrib
>>> p = gdtr(1.2, 3.4, 5.6)
>>> print(p)
0.94378087442
Verify the inverse.
>>> gdtrib(1.2, p, 5.6)
3.3999999999723882
""")
add_newdoc("scipy.special", "gdtrix",
"""
gdtrix(a, b, p, out=None)
Inverse of `gdtr` vs x.
Returns the inverse with respect to the parameter `x` of ``p =
gdtr(a, b, x)``, the cumulative distribution function of the gamma
distribution. This is also known as the p'th quantile of the
distribution.
Parameters
----------
a : array_like
`a` parameter values of `gdtr(a, b, x)`. `1/a` is the "scale"
parameter of the gamma distribution.
b : array_like
`b` parameter values of `gdtr(a, b, x)`. `b` is the "shape" parameter
of the gamma distribution.
p : array_like
Probability values.
out : ndarray, optional
If a fourth argument is given, it must be a numpy.ndarray whose size
matches the broadcast result of `a`, `b` and `x`. `out` is then the
array returned by the function.
Returns
-------
x : ndarray
Values of the `x` parameter such that `p = gdtr(a, b, x)`.
See Also
--------
gdtr : CDF of the gamma distribution.
gdtria : Inverse with respect to `a` of `gdtr(a, b, x)`.
gdtrib : Inverse with respect to `b` of `gdtr(a, b, x)`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfgam`.
The cumulative distribution function `p` is computed using a routine by
DiDinato and Morris [2]_. Computation of `x` involves a search for a value
that produces the desired value of `p`. The search relies on the
monotonicity of `p` with `x`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] DiDinato, A. R. and Morris, A. H.,
Computation of the incomplete gamma function ratios and their
inverse. ACM Trans. Math. Softw. 12 (1986), 377-393.
Examples
--------
First evaluate `gdtr`.
>>> from scipy.special import gdtr, gdtrix
>>> p = gdtr(1.2, 3.4, 5.6)
>>> print(p)
0.94378087442
Verify the inverse.
>>> gdtrix(1.2, 3.4, p)
5.5999999999999996
""")
add_newdoc("scipy.special", "hankel1",
r"""
hankel1(v, z)
Hankel function of the first kind
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
out : Values of the Hankel function of the first kind.
Notes
-----
A wrapper for the AMOS [1]_ routine `zbesh`, which carries out the
computation using the relation,
.. math:: H^{(1)}_v(z) = \frac{2}{\imath\pi} \exp(-\imath \pi v/2) K_v(z \exp(-\imath\pi/2))
where :math:`K_v` is the modified Bessel function of the second kind.
For negative orders, the relation
.. math:: H^{(1)}_{-v}(z) = H^{(1)}_v(z) \exp(\imath\pi v)
is used.
See also
--------
hankel1e : this function with leading exponential behavior stripped off.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "hankel1e",
r"""
hankel1e(v, z)
Exponentially scaled Hankel function of the first kind
Defined as::
hankel1e(v, z) = hankel1(v, z) * exp(-1j * z)
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
out : Values of the exponentially scaled Hankel function.
Notes
-----
A wrapper for the AMOS [1]_ routine `zbesh`, which carries out the
computation using the relation,
.. math:: H^{(1)}_v(z) = \frac{2}{\imath\pi} \exp(-\imath \pi v/2) K_v(z \exp(-\imath\pi/2))
where :math:`K_v` is the modified Bessel function of the second kind.
For negative orders, the relation
.. math:: H^{(1)}_{-v}(z) = H^{(1)}_v(z) \exp(\imath\pi v)
is used.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "hankel2",
r"""
hankel2(v, z)
Hankel function of the second kind
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
out : Values of the Hankel function of the second kind.
Notes
-----
A wrapper for the AMOS [1]_ routine `zbesh`, which carries out the
computation using the relation,
.. math:: H^{(2)}_v(z) = -\frac{2}{\imath\pi} \exp(\imath \pi v/2) K_v(z \exp(\imath\pi/2))
where :math:`K_v` is the modified Bessel function of the second kind.
For negative orders, the relation
.. math:: H^{(2)}_{-v}(z) = H^{(2)}_v(z) \exp(-\imath\pi v)
is used.
See also
--------
hankel2e : this function with leading exponential behavior stripped off.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "hankel2e",
r"""
hankel2e(v, z)
Exponentially scaled Hankel function of the second kind
Defined as::
hankel2e(v, z) = hankel2(v, z) * exp(1j * z)
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
out : Values of the exponentially scaled Hankel function of the second kind.
Notes
-----
A wrapper for the AMOS [1]_ routine `zbesh`, which carries out the
computation using the relation,
.. math:: H^{(2)}_v(z) = -\frac{2}{\imath\pi} \exp(\frac{\imath \pi v}{2}) K_v(z exp(\frac{\imath\pi}{2}))
where :math:`K_v` is the modified Bessel function of the second kind.
For negative orders, the relation
.. math:: H^{(2)}_{-v}(z) = H^{(2)}_v(z) \exp(-\imath\pi v)
is used.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "huber",
r"""
huber(delta, r)
Huber loss function.
.. math:: \text{huber}(\delta, r) = \begin{cases} \infty & \delta < 0 \\ \frac{1}{2}r^2 & 0 \le \delta, | r | \le \delta \\ \delta ( |r| - \frac{1}{2}\delta ) & \text{otherwise} \end{cases}
Parameters
----------
delta : ndarray
Input array, indicating the quadratic vs. linear loss changepoint.
r : ndarray
Input array, possibly representing residuals.
Returns
-------
res : ndarray
The computed Huber loss function values.
Notes
-----
This function is convex in r.
.. versionadded:: 0.15.0
""")
add_newdoc("scipy.special", "hyp0f1",
r"""
hyp0f1(v, x)
Confluent hypergeometric limit function 0F1.
Parameters
----------
v, z : array_like
Input values.
Returns
-------
hyp0f1 : ndarray
The confluent hypergeometric limit function.
Notes
-----
This function is defined as:
.. math:: _0F_1(v, z) = \sum_{k=0}^{\infty}\frac{z^k}{(v)_k k!}.
It's also the limit as :math:`q \to \infty` of :math:`_1F_1(q; v; z/q)`,
and satisfies the differential equation :math:`f''(z) + vf'(z) = f(z)`.
""")
add_newdoc("scipy.special", "hyp1f1",
"""
hyp1f1(a, b, x)
Confluent hypergeometric function 1F1(a, b; x)
""")
add_newdoc("scipy.special", "hyp1f2",
"""
hyp1f2(a, b, c, x)
Hypergeometric function 1F2 and error estimate
Returns
-------
y
Value of the function
err
Error estimate
""")
add_newdoc("scipy.special", "hyp2f0",
"""
hyp2f0(a, b, x, type)
Hypergeometric function 2F0 in y and an error estimate
The parameter `type` determines a convergence factor and can be
either 1 or 2.
Returns
-------
y
Value of the function
err
Error estimate
""")
add_newdoc("scipy.special", "hyp2f1",
r"""
hyp2f1(a, b, c, z)
Gauss hypergeometric function 2F1(a, b; c; z)
Parameters
----------
a, b, c : array_like
Arguments, should be real-valued.
z : array_like
Argument, real or complex.
Returns
-------
hyp2f1 : scalar or ndarray
The values of the gaussian hypergeometric function.
See also
--------
hyp0f1 : confluent hypergeometric limit function.
hyp1f1 : Kummer's (confluent hypergeometric) function.
Notes
-----
This function is defined for :math:`|z| < 1` as
.. math::
\mathrm{hyp2f1}(a, b, c, z) = \sum_{n=0}^\infty
\frac{(a)_n (b)_n}{(c)_n}\frac{z^n}{n!},
and defined on the rest of the complex z-plane by analytic continuation.
Here :math:`(\cdot)_n` is the Pochhammer symbol; see `poch`. When
:math:`n` is an integer the result is a polynomial of degree :math:`n`.
The implementation for complex values of ``z`` is described in [1]_.
References
----------
.. [1] S. Zhang and J.M. Jin, "Computation of Special Functions", Wiley 1996
.. [2] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [3] NIST Digital Library of Mathematical Functions
http://dlmf.nist.gov/
""")
add_newdoc("scipy.special", "hyp3f0",
"""
hyp3f0(a, b, c, x)
Hypergeometric function 3F0 in y and an error estimate
Returns
-------
y
Value of the function
err
Error estimate
""")
add_newdoc("scipy.special", "hyperu",
"""
hyperu(a, b, x)
Confluent hypergeometric function U(a, b, x) of the second kind
""")
add_newdoc("scipy.special", "i0",
r"""
i0(x)
Modified Bessel function of order 0.
Defined as,
.. math::
I_0(x) = \sum_{k=0}^\infty \frac{(x^2/4)^k}{(k!)^2} = J_0(\imath x),
where :math:`J_0` is the Bessel function of the first kind of order 0.
Parameters
----------
x : array_like
Argument (float)
Returns
-------
I : ndarray
Value of the modified Bessel function of order 0 at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 8] and (8, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `i0`.
See also
--------
iv
i0e
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "i0e",
"""
i0e(x)
Exponentially scaled modified Bessel function of order 0.
Defined as::
i0e(x) = exp(-abs(x)) * i0(x).
Parameters
----------
x : array_like
Argument (float)
Returns
-------
I : ndarray
Value of the exponentially scaled modified Bessel function of order 0
at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 8] and (8, infinity).
Chebyshev polynomial expansions are employed in each interval. The
polynomial expansions used are the same as those in `i0`, but
they are not multiplied by the dominant exponential factor.
This function is a wrapper for the Cephes [1]_ routine `i0e`.
See also
--------
iv
i0
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "i1",
r"""
i1(x)
Modified Bessel function of order 1.
Defined as,
.. math::
I_1(x) = \frac{1}{2}x \sum_{k=0}^\infty \frac{(x^2/4)^k}{k! (k + 1)!}
= -\imath J_1(\imath x),
where :math:`J_1` is the Bessel function of the first kind of order 1.
Parameters
----------
x : array_like
Argument (float)
Returns
-------
I : ndarray
Value of the modified Bessel function of order 1 at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 8] and (8, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `i1`.
See also
--------
iv
i1e
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "i1e",
"""
i1e(x)
Exponentially scaled modified Bessel function of order 1.
Defined as::
i1e(x) = exp(-abs(x)) * i1(x)
Parameters
----------
x : array_like
Argument (float)
Returns
-------
I : ndarray
Value of the exponentially scaled modified Bessel function of order 1
at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 8] and (8, infinity).
Chebyshev polynomial expansions are employed in each interval. The
polynomial expansions used are the same as those in `i1`, but
they are not multiplied by the dominant exponential factor.
This function is a wrapper for the Cephes [1]_ routine `i1e`.
See also
--------
iv
i1
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "_igam_fac",
"""
Internal function, do not use.
""")
add_newdoc("scipy.special", "it2i0k0",
"""
it2i0k0(x)
Integrals related to modified Bessel functions of order 0
Returns
-------
ii0
``integral((i0(t)-1)/t, t=0..x)``
ik0
``int(k0(t)/t, t=x..inf)``
""")
add_newdoc("scipy.special", "it2j0y0",
"""
it2j0y0(x)
Integrals related to Bessel functions of order 0
Returns
-------
ij0
``integral((1-j0(t))/t, t=0..x)``
iy0
``integral(y0(t)/t, t=x..inf)``
""")
add_newdoc("scipy.special", "it2struve0",
r"""
it2struve0(x)
Integral related to the Struve function of order 0.
Returns the integral,
.. math::
\int_x^\infty \frac{H_0(t)}{t}\,dt
where :math:`H_0` is the Struve function of order 0.
Parameters
----------
x : array_like
Lower limit of integration.
Returns
-------
I : ndarray
The value of the integral.
See also
--------
struve
Notes
-----
Wrapper for a Fortran routine created by Shanjie Zhang and Jianming
Jin [1]_.
References
----------
.. [1] Zhang, Shanjie and Jin, Jianming. "Computation of Special
Functions", John Wiley and Sons, 1996.
https://people.sc.fsu.edu/~jburkardt/f_src/special_functions/special_functions.html
""")
add_newdoc("scipy.special", "itairy",
"""
itairy(x)
Integrals of Airy functions
Calculates the integrals of Airy functions from 0 to `x`.
Parameters
----------
x: array_like
Upper limit of integration (float).
Returns
-------
Apt
Integral of Ai(t) from 0 to x.
Bpt
Integral of Bi(t) from 0 to x.
Ant
Integral of Ai(-t) from 0 to x.
Bnt
Integral of Bi(-t) from 0 to x.
Notes
-----
Wrapper for a Fortran routine created by Shanjie Zhang and Jianming
Jin [1]_.
References
----------
.. [1] Zhang, Shanjie and Jin, Jianming. "Computation of Special
Functions", John Wiley and Sons, 1996.
https://people.sc.fsu.edu/~jburkardt/f_src/special_functions/special_functions.html
""")
add_newdoc("scipy.special", "iti0k0",
"""
iti0k0(x)
Integrals of modified Bessel functions of order 0
Returns simple integrals from 0 to `x` of the zeroth order modified
Bessel functions `i0` and `k0`.
Returns
-------
ii0, ik0
""")
add_newdoc("scipy.special", "itj0y0",
"""
itj0y0(x)
Integrals of Bessel functions of order 0
Returns simple integrals from 0 to `x` of the zeroth order Bessel
functions `j0` and `y0`.
Returns
-------
ij0, iy0
""")
add_newdoc("scipy.special", "itmodstruve0",
r"""
itmodstruve0(x)
Integral of the modified Struve function of order 0.
.. math::
I = \int_0^x L_0(t)\,dt
Parameters
----------
x : array_like
Upper limit of integration (float).
Returns
-------
I : ndarray
The integral of :math:`L_0` from 0 to `x`.
Notes
-----
Wrapper for a Fortran routine created by Shanjie Zhang and Jianming
Jin [1]_.
References
----------
.. [1] Zhang, Shanjie and Jin, Jianming. "Computation of Special
Functions", John Wiley and Sons, 1996.
https://people.sc.fsu.edu/~jburkardt/f_src/special_functions/special_functions.html
""")
add_newdoc("scipy.special", "itstruve0",
r"""
itstruve0(x)
Integral of the Struve function of order 0.
.. math::
I = \int_0^x H_0(t)\,dt
Parameters
----------
x : array_like
Upper limit of integration (float).
Returns
-------
I : ndarray
The integral of :math:`H_0` from 0 to `x`.
See also
--------
struve
Notes
-----
Wrapper for a Fortran routine created by Shanjie Zhang and Jianming
Jin [1]_.
References
----------
.. [1] Zhang, Shanjie and Jin, Jianming. "Computation of Special
Functions", John Wiley and Sons, 1996.
https://people.sc.fsu.edu/~jburkardt/f_src/special_functions/special_functions.html
""")
add_newdoc("scipy.special", "iv",
r"""
iv(v, z)
Modified Bessel function of the first kind of real order.
Parameters
----------
v : array_like
Order. If `z` is of real type and negative, `v` must be integer
valued.
z : array_like of float or complex
Argument.
Returns
-------
out : ndarray
Values of the modified Bessel function.
Notes
-----
For real `z` and :math:`v \in [-50, 50]`, the evaluation is carried out
using Temme's method [1]_. For larger orders, uniform asymptotic
expansions are applied.
For complex `z` and positive `v`, the AMOS [2]_ `zbesi` routine is
called. It uses a power series for small `z`, the asymptotic expansion
for large `abs(z)`, the Miller algorithm normalized by the Wronskian
and a Neumann series for intermediate magnitudes, and the uniform
asymptotic expansions for :math:`I_v(z)` and :math:`J_v(z)` for large
orders. Backward recurrence is used to generate sequences or reduce
orders when necessary.
The calculations above are done in the right half plane and continued
into the left half plane by the formula,
.. math:: I_v(z \exp(\pm\imath\pi)) = \exp(\pm\pi v) I_v(z)
(valid when the real part of `z` is positive). For negative `v`, the
formula
.. math:: I_{-v}(z) = I_v(z) + \frac{2}{\pi} \sin(\pi v) K_v(z)
is used, where :math:`K_v(z)` is the modified Bessel function of the
second kind, evaluated using the AMOS routine `zbesk`.
See also
--------
kve : This function with leading exponential behavior stripped off.
References
----------
.. [1] Temme, Journal of Computational Physics, vol 21, 343 (1976)
.. [2] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "ive",
r"""
ive(v, z)
Exponentially scaled modified Bessel function of the first kind
Defined as::
ive(v, z) = iv(v, z) * exp(-abs(z.real))
Parameters
----------
v : array_like of float
Order.
z : array_like of float or complex
Argument.
Returns
-------
out : ndarray
Values of the exponentially scaled modified Bessel function.
Notes
-----
For positive `v`, the AMOS [1]_ `zbesi` routine is called. It uses a
power series for small `z`, the asymptotic expansion for large
`abs(z)`, the Miller algorithm normalized by the Wronskian and a
Neumann series for intermediate magnitudes, and the uniform asymptotic
expansions for :math:`I_v(z)` and :math:`J_v(z)` for large orders.
Backward recurrence is used to generate sequences or reduce orders when
necessary.
The calculations above are done in the right half plane and continued
into the left half plane by the formula,
.. math:: I_v(z \exp(\pm\imath\pi)) = \exp(\pm\pi v) I_v(z)
(valid when the real part of `z` is positive). For negative `v`, the
formula
.. math:: I_{-v}(z) = I_v(z) + \frac{2}{\pi} \sin(\pi v) K_v(z)
is used, where :math:`K_v(z)` is the modified Bessel function of the
second kind, evaluated using the AMOS routine `zbesk`.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "j0",
r"""
j0(x)
Bessel function of the first kind of order 0.
Parameters
----------
x : array_like
Argument (float).
Returns
-------
J : ndarray
Value of the Bessel function of the first kind of order 0 at `x`.
Notes
-----
The domain is divided into the intervals [0, 5] and (5, infinity). In the
first interval the following rational approximation is used:
.. math::
J_0(x) \approx (w - r_1^2)(w - r_2^2) \frac{P_3(w)}{Q_8(w)},
where :math:`w = x^2` and :math:`r_1`, :math:`r_2` are the zeros of
:math:`J_0`, and :math:`P_3` and :math:`Q_8` are polynomials of degrees 3
and 8, respectively.
In the second interval, the Hankel asymptotic expansion is employed with
two rational functions of degree 6/6 and 7/7.
This function is a wrapper for the Cephes [1]_ routine `j0`.
It should not be confused with the spherical Bessel functions (see
`spherical_jn`).
See also
--------
jv : Bessel function of real order and complex argument.
spherical_jn : spherical Bessel functions.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "j1",
"""
j1(x)
Bessel function of the first kind of order 1.
Parameters
----------
x : array_like
Argument (float).
Returns
-------
J : ndarray
Value of the Bessel function of the first kind of order 1 at `x`.
Notes
-----
The domain is divided into the intervals [0, 8] and (8, infinity). In the
first interval a 24 term Chebyshev expansion is used. In the second, the
asymptotic trigonometric representation is employed using two rational
functions of degree 5/5.
This function is a wrapper for the Cephes [1]_ routine `j1`.
It should not be confused with the spherical Bessel functions (see
`spherical_jn`).
See also
--------
jv
spherical_jn : spherical Bessel functions.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "jn",
"""
jn(n, x)
Bessel function of the first kind of integer order and real argument.
Notes
-----
`jn` is an alias of `jv`.
Not to be confused with the spherical Bessel functions (see `spherical_jn`).
See also
--------
jv
spherical_jn : spherical Bessel functions.
""")
add_newdoc("scipy.special", "jv",
r"""
jv(v, z)
Bessel function of the first kind of real order and complex argument.
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
J : ndarray
Value of the Bessel function, :math:`J_v(z)`.
Notes
-----
For positive `v` values, the computation is carried out using the AMOS
[1]_ `zbesj` routine, which exploits the connection to the modified
Bessel function :math:`I_v`,
.. math::
J_v(z) = \exp(v\pi\imath/2) I_v(-\imath z)\qquad (\Im z > 0)
J_v(z) = \exp(-v\pi\imath/2) I_v(\imath z)\qquad (\Im z < 0)
For negative `v` values the formula,
.. math:: J_{-v}(z) = J_v(z) \cos(\pi v) - Y_v(z) \sin(\pi v)
is used, where :math:`Y_v(z)` is the Bessel function of the second
kind, computed using the AMOS routine `zbesy`. Note that the second
term is exactly zero for integer `v`; to improve accuracy the second
term is explicitly omitted for `v` values such that `v = floor(v)`.
Not to be confused with the spherical Bessel functions (see `spherical_jn`).
See also
--------
jve : :math:`J_v` with leading exponential behavior stripped off.
spherical_jn : spherical Bessel functions.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "jve",
r"""
jve(v, z)
Exponentially scaled Bessel function of order `v`.
Defined as::
jve(v, z) = jv(v, z) * exp(-abs(z.imag))
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
J : ndarray
Value of the exponentially scaled Bessel function.
Notes
-----
For positive `v` values, the computation is carried out using the AMOS
[1]_ `zbesj` routine, which exploits the connection to the modified
Bessel function :math:`I_v`,
.. math::
J_v(z) = \exp(v\pi\imath/2) I_v(-\imath z)\qquad (\Im z > 0)
J_v(z) = \exp(-v\pi\imath/2) I_v(\imath z)\qquad (\Im z < 0)
For negative `v` values the formula,
.. math:: J_{-v}(z) = J_v(z) \cos(\pi v) - Y_v(z) \sin(\pi v)
is used, where :math:`Y_v(z)` is the Bessel function of the second
kind, computed using the AMOS routine `zbesy`. Note that the second
term is exactly zero for integer `v`; to improve accuracy the second
term is explicitly omitted for `v` values such that `v = floor(v)`.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "k0",
r"""
k0(x)
Modified Bessel function of the second kind of order 0, :math:`K_0`.
This function is also sometimes referred to as the modified Bessel
function of the third kind of order 0.
Parameters
----------
x : array_like
Argument (float).
Returns
-------
K : ndarray
Value of the modified Bessel function :math:`K_0` at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 2] and (2, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `k0`.
See also
--------
kv
k0e
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "k0e",
"""
k0e(x)
Exponentially scaled modified Bessel function K of order 0
Defined as::
k0e(x) = exp(x) * k0(x).
Parameters
----------
x : array_like
Argument (float)
Returns
-------
K : ndarray
Value of the exponentially scaled modified Bessel function K of order
0 at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 2] and (2, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `k0e`.
See also
--------
kv
k0
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "k1",
"""
k1(x)
Modified Bessel function of the second kind of order 1, :math:`K_1(x)`.
Parameters
----------
x : array_like
Argument (float)
Returns
-------
K : ndarray
Value of the modified Bessel function K of order 1 at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 2] and (2, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `k1`.
See also
--------
kv
k1e
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "k1e",
"""
k1e(x)
Exponentially scaled modified Bessel function K of order 1
Defined as::
k1e(x) = exp(x) * k1(x)
Parameters
----------
x : array_like
Argument (float)
Returns
-------
K : ndarray
Value of the exponentially scaled modified Bessel function K of order
1 at `x`.
Notes
-----
The range is partitioned into the two intervals [0, 2] and (2, infinity).
Chebyshev polynomial expansions are employed in each interval.
This function is a wrapper for the Cephes [1]_ routine `k1e`.
See also
--------
kv
k1
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "kei",
"""
kei(x)
Kelvin function ker
""")
add_newdoc("scipy.special", "keip",
"""
keip(x)
Derivative of the Kelvin function kei
""")
add_newdoc("scipy.special", "kelvin",
"""
kelvin(x)
Kelvin functions as complex numbers
Returns
-------
Be, Ke, Bep, Kep
The tuple (Be, Ke, Bep, Kep) contains complex numbers
representing the real and imaginary Kelvin functions and their
derivatives evaluated at `x`. For example, kelvin(x)[0].real =
ber x and kelvin(x)[0].imag = bei x with similar relationships
for ker and kei.
""")
add_newdoc("scipy.special", "ker",
"""
ker(x)
Kelvin function ker
""")
add_newdoc("scipy.special", "kerp",
"""
kerp(x)
Derivative of the Kelvin function ker
""")
add_newdoc("scipy.special", "kl_div",
r"""
kl_div(x, y)
Elementwise function for computing Kullback-Leibler divergence.
.. math:: \mathrm{kl\_div}(x, y) = \begin{cases} x \log(x / y) - x + y & x > 0, y > 0 \\ y & x = 0, y \ge 0 \\ \infty & \text{otherwise} \end{cases}
Parameters
----------
x : ndarray
First input array.
y : ndarray
Second input array.
Returns
-------
res : ndarray
Output array.
See Also
--------
entr, rel_entr
Notes
-----
This function is non-negative and is jointly convex in `x` and `y`.
.. versionadded:: 0.15.0
""")
add_newdoc("scipy.special", "kn",
r"""
kn(n, x)
Modified Bessel function of the second kind of integer order `n`
Returns the modified Bessel function of the second kind for integer order
`n` at real `z`.
These are also sometimes called functions of the third kind, Basset
functions, or Macdonald functions.
Parameters
----------
n : array_like of int
Order of Bessel functions (floats will truncate with a warning)
z : array_like of float
Argument at which to evaluate the Bessel functions
Returns
-------
out : ndarray
The results
Notes
-----
Wrapper for AMOS [1]_ routine `zbesk`. For a discussion of the
algorithm used, see [2]_ and the references therein.
See Also
--------
kv : Same function, but accepts real order and complex argument
kvp : Derivative of this function
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
.. [2] Donald E. Amos, "Algorithm 644: A portable package for Bessel
functions of a complex argument and nonnegative order", ACM
TOMS Vol. 12 Issue 3, Sept. 1986, p. 265
Examples
--------
Plot the function of several orders for real input:
>>> from scipy.special import kn
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(0, 5, 1000)
>>> for N in range(6):
... plt.plot(x, kn(N, x), label='$K_{}(x)$'.format(N))
>>> plt.ylim(0, 10)
>>> plt.legend()
>>> plt.title(r'Modified Bessel function of the second kind $K_n(x)$')
>>> plt.show()
Calculate for a single value at multiple orders:
>>> kn([4, 5, 6], 1)
array([ 44.23241585, 360.9605896 , 3653.83831186])
""")
add_newdoc("scipy.special", "kolmogi",
"""
kolmogi(p)
Inverse function to kolmogorov
Returns y such that ``kolmogorov(y) == p``.
""")
add_newdoc("scipy.special", "kolmogorov",
"""
kolmogorov(y)
Complementary cumulative distribution function of Kolmogorov distribution
Returns the complementary cumulative distribution function of
Kolmogorov's limiting distribution (Kn* for large n) of a
two-sided test for equality between an empirical and a theoretical
distribution. It is equal to the (limit as n->infinity of the)
probability that sqrt(n) * max absolute deviation > y.
""")
add_newdoc("scipy.special", "kv",
r"""
kv(v, z)
Modified Bessel function of the second kind of real order `v`
Returns the modified Bessel function of the second kind for real order
`v` at complex `z`.
These are also sometimes called functions of the third kind, Basset
functions, or Macdonald functions. They are defined as those solutions
of the modified Bessel equation for which,
.. math::
K_v(x) \sim \sqrt{\pi/(2x)} \exp(-x)
as :math:`x \to \infty` [3]_.
Parameters
----------
v : array_like of float
Order of Bessel functions
z : array_like of complex
Argument at which to evaluate the Bessel functions
Returns
-------
out : ndarray
The results. Note that input must be of complex type to get complex
output, e.g. ``kv(3, -2+0j)`` instead of ``kv(3, -2)``.
Notes
-----
Wrapper for AMOS [1]_ routine `zbesk`. For a discussion of the
algorithm used, see [2]_ and the references therein.
See Also
--------
kve : This function with leading exponential behavior stripped off.
kvp : Derivative of this function
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
.. [2] Donald E. Amos, "Algorithm 644: A portable package for Bessel
functions of a complex argument and nonnegative order", ACM
TOMS Vol. 12 Issue 3, Sept. 1986, p. 265
.. [3] NIST Digital Library of Mathematical Functions,
Eq. 10.25.E3. http://dlmf.nist.gov/10.25.E3
Examples
--------
Plot the function of several orders for real input:
>>> from scipy.special import kv
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(0, 5, 1000)
>>> for N in np.linspace(0, 6, 5):
... plt.plot(x, kv(N, x), label='$K_{{{}}}(x)$'.format(N))
>>> plt.ylim(0, 10)
>>> plt.legend()
>>> plt.title(r'Modified Bessel function of the second kind $K_\nu(x)$')
>>> plt.show()
Calculate for a single value at multiple orders:
>>> kv([4, 4.5, 5], 1+2j)
array([ 0.1992+2.3892j, 2.3493+3.6j , 7.2827+3.8104j])
""")
add_newdoc("scipy.special", "kve",
r"""
kve(v, z)
Exponentially scaled modified Bessel function of the second kind.
Returns the exponentially scaled, modified Bessel function of the
second kind (sometimes called the third kind) for real order `v` at
complex `z`::
kve(v, z) = kv(v, z) * exp(z)
Parameters
----------
v : array_like of float
Order of Bessel functions
z : array_like of complex
Argument at which to evaluate the Bessel functions
Returns
-------
out : ndarray
The exponentially scaled modified Bessel function of the second kind.
Notes
-----
Wrapper for AMOS [1]_ routine `zbesk`. For a discussion of the
algorithm used, see [2]_ and the references therein.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
.. [2] Donald E. Amos, "Algorithm 644: A portable package for Bessel
functions of a complex argument and nonnegative order", ACM
TOMS Vol. 12 Issue 3, Sept. 1986, p. 265
""")
add_newdoc("scipy.special", "_lanczos_sum_expg_scaled",
"""
Internal function, do not use.
""")
add_newdoc("scipy.special", "_lgam1p",
"""
Internal function, do not use.
""")
add_newdoc("scipy.special", "log1p",
"""
log1p(x)
Calculates log(1+x) for use when `x` is near zero
""")
add_newdoc("scipy.special", "_log1pmx",
"""
Internal function, do not use.
""")
add_newdoc('scipy.special', 'logit',
"""
logit(x)
Logit ufunc for ndarrays.
The logit function is defined as logit(p) = log(p/(1-p)).
Note that logit(0) = -inf, logit(1) = inf, and logit(p)
for p<0 or p>1 yields nan.
Parameters
----------
x : ndarray
The ndarray to apply logit to element-wise.
Returns
-------
out : ndarray
An ndarray of the same shape as x. Its entries
are logit of the corresponding entry of x.
See Also
--------
expit
Notes
-----
As a ufunc logit takes a number of optional
keyword arguments. For more information
see `ufuncs <https://docs.scipy.org/doc/numpy/reference/ufuncs.html>`_
.. versionadded:: 0.10.0
Examples
--------
>>> from scipy.special import logit, expit
>>> logit([0, 0.25, 0.5, 0.75, 1])
array([ -inf, -1.09861229, 0. , 1.09861229, inf])
`expit` is the inverse of `logit`:
>>> expit(logit([0.1, 0.75, 0.999]))
array([ 0.1 , 0.75 , 0.999])
Plot logit(x) for x in [0, 1]:
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(0, 1, 501)
>>> y = logit(x)
>>> plt.plot(x, y)
>>> plt.grid()
>>> plt.ylim(-6, 6)
>>> plt.xlabel('x')
>>> plt.title('logit(x)')
>>> plt.show()
""")
add_newdoc("scipy.special", "lpmv",
r"""
lpmv(m, v, x)
Associated Legendre function of integer order and real degree.
Defined as
.. math::
P_v^m = (-1)^m (1 - x^2)^{m/2} \frac{d^m}{dx^m} P_v(x)
where
.. math::
P_v = \sum_{k = 0}^\infty \frac{(-v)_k (v + 1)_k}{(k!)^2}
\left(\frac{1 - x}{2}\right)^k
is the Legendre function of the first kind. Here :math:`(\cdot)_k`
is the Pochhammer symbol; see `poch`.
Parameters
----------
m : array_like
Order (int or float). If passed a float not equal to an
integer the function returns NaN.
v : array_like
Degree (float).
x : array_like
Argument (float). Must have ``|x| <= 1``.
Returns
-------
pmv : ndarray
Value of the associated Legendre function.
See Also
--------
lpmn : Compute the associated Legendre function for all orders
``0, ..., m`` and degrees ``0, ..., n``.
clpmn : Compute the associated Legendre function at complex
arguments.
Notes
-----
Note that this implementation includes the Condon-Shortley phase.
References
----------
.. [1] Zhang, Jin, "Computation of Special Functions", John Wiley
and Sons, Inc, 1996.
""")
add_newdoc("scipy.special", "mathieu_a",
"""
mathieu_a(m, q)
Characteristic value of even Mathieu functions
Returns the characteristic value for the even solution,
``ce_m(z, q)``, of Mathieu's equation.
""")
add_newdoc("scipy.special", "mathieu_b",
"""
mathieu_b(m, q)
Characteristic value of odd Mathieu functions
Returns the characteristic value for the odd solution,
``se_m(z, q)``, of Mathieu's equation.
""")
add_newdoc("scipy.special", "mathieu_cem",
"""
mathieu_cem(m, q, x)
Even Mathieu function and its derivative
Returns the even Mathieu function, ``ce_m(x, q)``, of order `m` and
parameter `q` evaluated at `x` (given in degrees). Also returns the
derivative with respect to `x` of ce_m(x, q)
Parameters
----------
m
Order of the function
q
Parameter of the function
x
Argument of the function, *given in degrees, not radians*
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "mathieu_modcem1",
"""
mathieu_modcem1(m, q, x)
Even modified Mathieu function of the first kind and its derivative
Evaluates the even modified Mathieu function of the first kind,
``Mc1m(x, q)``, and its derivative at `x` for order `m` and parameter
`q`.
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "mathieu_modcem2",
"""
mathieu_modcem2(m, q, x)
Even modified Mathieu function of the second kind and its derivative
Evaluates the even modified Mathieu function of the second kind,
Mc2m(x, q), and its derivative at `x` (given in degrees) for order `m`
and parameter `q`.
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "mathieu_modsem1",
"""
mathieu_modsem1(m, q, x)
Odd modified Mathieu function of the first kind and its derivative
Evaluates the odd modified Mathieu function of the first kind,
Ms1m(x, q), and its derivative at `x` (given in degrees) for order `m`
and parameter `q`.
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "mathieu_modsem2",
"""
mathieu_modsem2(m, q, x)
Odd modified Mathieu function of the second kind and its derivative
Evaluates the odd modified Mathieu function of the second kind,
Ms2m(x, q), and its derivative at `x` (given in degrees) for order `m`
and parameter q.
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "mathieu_sem",
"""
mathieu_sem(m, q, x)
Odd Mathieu function and its derivative
Returns the odd Mathieu function, se_m(x, q), of order `m` and
parameter `q` evaluated at `x` (given in degrees). Also returns the
derivative with respect to `x` of se_m(x, q).
Parameters
----------
m
Order of the function
q
Parameter of the function
x
Argument of the function, *given in degrees, not radians*.
Returns
-------
y
Value of the function
yp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "modfresnelm",
"""
modfresnelm(x)
Modified Fresnel negative integrals
Returns
-------
fm
Integral ``F_-(x)``: ``integral(exp(-1j*t*t), t=x..inf)``
km
Integral ``K_-(x)``: ``1/sqrt(pi)*exp(1j*(x*x+pi/4))*fp``
""")
add_newdoc("scipy.special", "modfresnelp",
"""
modfresnelp(x)
Modified Fresnel positive integrals
Returns
-------
fp
Integral ``F_+(x)``: ``integral(exp(1j*t*t), t=x..inf)``
kp
Integral ``K_+(x)``: ``1/sqrt(pi)*exp(-1j*(x*x+pi/4))*fp``
""")
add_newdoc("scipy.special", "modstruve",
r"""
modstruve(v, x)
Modified Struve function.
Return the value of the modified Struve function of order `v` at `x`. The
modified Struve function is defined as,
.. math::
L_v(x) = -\imath \exp(-\pi\imath v/2) H_v(x),
where :math:`H_v` is the Struve function.
Parameters
----------
v : array_like
Order of the modified Struve function (float).
x : array_like
Argument of the Struve function (float; must be positive unless `v` is
an integer).
Returns
-------
L : ndarray
Value of the modified Struve function of order `v` at `x`.
Notes
-----
Three methods discussed in [1]_ are used to evaluate the function:
- power series
- expansion in Bessel functions (if :math:`|z| < |v| + 20`)
- asymptotic large-z expansion (if :math:`z \geq 0.7v + 12`)
Rounding errors are estimated based on the largest terms in the sums, and
the result associated with the smallest error is returned.
See also
--------
struve
References
----------
.. [1] NIST Digital Library of Mathematical Functions
http://dlmf.nist.gov/11
""")
add_newdoc("scipy.special", "nbdtr",
r"""
nbdtr(k, n, p)
Negative binomial cumulative distribution function.
Returns the sum of the terms 0 through `k` of the negative binomial
distribution probability mass function,
.. math::
F = \sum_{j=0}^k {{n + j - 1}\choose{j}} p^n (1 - p)^j.
In a sequence of Bernoulli trials with individual success probabilities
`p`, this is the probability that `k` or fewer failures precede the nth
success.
Parameters
----------
k : array_like
The maximum number of allowed failures (nonnegative int).
n : array_like
The target number of successes (positive int).
p : array_like
Probability of success in a single event (float).
Returns
-------
F : ndarray
The probability of `k` or fewer failures before `n` successes in a
sequence of events with individual success probability `p`.
See also
--------
nbdtrc
Notes
-----
If floating point values are passed for `k` or `n`, they will be truncated
to integers.
The terms are not summed directly; instead the regularized incomplete beta
function is employed, according to the formula,
.. math::
\mathrm{nbdtr}(k, n, p) = I_{p}(n, k + 1).
Wrapper for the Cephes [1]_ routine `nbdtr`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "nbdtrc",
r"""
nbdtrc(k, n, p)
Negative binomial survival function.
Returns the sum of the terms `k + 1` to infinity of the negative binomial
distribution probability mass function,
.. math::
F = \sum_{j=k + 1}^\infty {{n + j - 1}\choose{j}} p^n (1 - p)^j.
In a sequence of Bernoulli trials with individual success probabilities
`p`, this is the probability that more than `k` failures precede the nth
success.
Parameters
----------
k : array_like
The maximum number of allowed failures (nonnegative int).
n : array_like
The target number of successes (positive int).
p : array_like
Probability of success in a single event (float).
Returns
-------
F : ndarray
The probability of `k + 1` or more failures before `n` successes in a
sequence of events with individual success probability `p`.
Notes
-----
If floating point values are passed for `k` or `n`, they will be truncated
to integers.
The terms are not summed directly; instead the regularized incomplete beta
function is employed, according to the formula,
.. math::
\mathrm{nbdtrc}(k, n, p) = I_{1 - p}(k + 1, n).
Wrapper for the Cephes [1]_ routine `nbdtrc`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "nbdtri",
"""
nbdtri(k, n, y)
Inverse of `nbdtr` vs `p`.
Returns the inverse with respect to the parameter `p` of
`y = nbdtr(k, n, p)`, the negative binomial cumulative distribution
function.
Parameters
----------
k : array_like
The maximum number of allowed failures (nonnegative int).
n : array_like
The target number of successes (positive int).
y : array_like
The probability of `k` or fewer failures before `n` successes (float).
Returns
-------
p : ndarray
Probability of success in a single event (float) such that
`nbdtr(k, n, p) = y`.
See also
--------
nbdtr : Cumulative distribution function of the negative binomial.
nbdtrik : Inverse with respect to `k` of `nbdtr(k, n, p)`.
nbdtrin : Inverse with respect to `n` of `nbdtr(k, n, p)`.
Notes
-----
Wrapper for the Cephes [1]_ routine `nbdtri`.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "nbdtrik",
r"""
nbdtrik(y, n, p)
Inverse of `nbdtr` vs `k`.
Returns the inverse with respect to the parameter `k` of
`y = nbdtr(k, n, p)`, the negative binomial cumulative distribution
function.
Parameters
----------
y : array_like
The probability of `k` or fewer failures before `n` successes (float).
n : array_like
The target number of successes (positive int).
p : array_like
Probability of success in a single event (float).
Returns
-------
k : ndarray
The maximum number of allowed failures such that `nbdtr(k, n, p) = y`.
See also
--------
nbdtr : Cumulative distribution function of the negative binomial.
nbdtri : Inverse with respect to `p` of `nbdtr(k, n, p)`.
nbdtrin : Inverse with respect to `n` of `nbdtr(k, n, p)`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfnbn`.
Formula 26.5.26 of [2]_,
.. math::
\sum_{j=k + 1}^\infty {{n + j - 1}\choose{j}} p^n (1 - p)^j = I_{1 - p}(k + 1, n),
is used to reduce calculation of the cumulative distribution function to
that of a regularized incomplete beta :math:`I`.
Computation of `k` involves a search for a value that produces the desired
value of `y`. The search relies on the monotonicity of `y` with `k`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
""")
add_newdoc("scipy.special", "nbdtrin",
r"""
nbdtrin(k, y, p)
Inverse of `nbdtr` vs `n`.
Returns the inverse with respect to the parameter `n` of
`y = nbdtr(k, n, p)`, the negative binomial cumulative distribution
function.
Parameters
----------
k : array_like
The maximum number of allowed failures (nonnegative int).
y : array_like
The probability of `k` or fewer failures before `n` successes (float).
p : array_like
Probability of success in a single event (float).
Returns
-------
n : ndarray
The number of successes `n` such that `nbdtr(k, n, p) = y`.
See also
--------
nbdtr : Cumulative distribution function of the negative binomial.
nbdtri : Inverse with respect to `p` of `nbdtr(k, n, p)`.
nbdtrik : Inverse with respect to `k` of `nbdtr(k, n, p)`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdfnbn`.
Formula 26.5.26 of [2]_,
.. math::
\sum_{j=k + 1}^\infty {{n + j - 1}\choose{j}} p^n (1 - p)^j = I_{1 - p}(k + 1, n),
is used to reduce calculation of the cumulative distribution function to
that of a regularized incomplete beta :math:`I`.
Computation of `n` involves a search for a value that produces the desired
value of `y`. The search relies on the monotonicity of `y` with `n`.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
""")
add_newdoc("scipy.special", "ncfdtr",
r"""
ncfdtr(dfn, dfd, nc, f)
Cumulative distribution function of the non-central F distribution.
The non-central F describes the distribution of,
.. math::
Z = \frac{X/d_n}{Y/d_d}
where :math:`X` and :math:`Y` are independently distributed, with
:math:`X` distributed non-central :math:`\chi^2` with noncentrality
parameter `nc` and :math:`d_n` degrees of freedom, and :math:`Y`
distributed :math:`\chi^2` with :math:`d_d` degrees of freedom.
Parameters
----------
dfn : array_like
Degrees of freedom of the numerator sum of squares. Range (0, inf).
dfd : array_like
Degrees of freedom of the denominator sum of squares. Range (0, inf).
nc : array_like
Noncentrality parameter. Should be in range (0, 1e4).
f : array_like
Quantiles, i.e. the upper limit of integration.
Returns
-------
cdf : float or ndarray
The calculated CDF. If all inputs are scalar, the return will be a
float. Otherwise it will be an array.
See Also
--------
ncfdtri : Quantile function; inverse of `ncfdtr` with respect to `f`.
ncfdtridfd : Inverse of `ncfdtr` with respect to `dfd`.
ncfdtridfn : Inverse of `ncfdtr` with respect to `dfn`.
ncfdtrinc : Inverse of `ncfdtr` with respect to `nc`.
Notes
-----
Wrapper for the CDFLIB [1]_ Fortran routine `cdffnc`.
The cumulative distribution function is computed using Formula 26.6.20 of
[2]_:
.. math::
F(d_n, d_d, n_c, f) = \sum_{j=0}^\infty e^{-n_c/2} \frac{(n_c/2)^j}{j!} I_{x}(\frac{d_n}{2} + j, \frac{d_d}{2}),
where :math:`I` is the regularized incomplete beta function, and
:math:`x = f d_n/(f d_n + d_d)`.
The computation time required for this routine is proportional to the
noncentrality parameter `nc`. Very large values of this parameter can
consume immense computer resources. This is why the search range is
bounded by 10,000.
References
----------
.. [1] Barry Brown, James Lovato, and Kathy Russell,
CDFLIB: Library of Fortran Routines for Cumulative Distribution
Functions, Inverses, and Other Parameters.
.. [2] Milton Abramowitz and Irene A. Stegun, eds.
Handbook of Mathematical Functions with Formulas,
Graphs, and Mathematical Tables. New York: Dover, 1972.
Examples
--------
>>> from scipy import special
>>> from scipy import stats
>>> import matplotlib.pyplot as plt
Plot the CDF of the non-central F distribution, for nc=0. Compare with the
F-distribution from scipy.stats:
>>> x = np.linspace(-1, 8, num=500)
>>> dfn = 3
>>> dfd = 2
>>> ncf_stats = stats.f.cdf(x, dfn, dfd)
>>> ncf_special = special.ncfdtr(dfn, dfd, 0, x)
>>> fig = plt.figure()
>>> ax = fig.add_subplot(111)
>>> ax.plot(x, ncf_stats, 'b-', lw=3)
>>> ax.plot(x, ncf_special, 'r-')
>>> plt.show()
""")
add_newdoc("scipy.special", "ncfdtri",
"""
ncfdtri(dfn, dfd, nc, p)
Inverse with respect to `f` of the CDF of the non-central F distribution.
See `ncfdtr` for more details.
Parameters
----------
dfn : array_like
Degrees of freedom of the numerator sum of squares. Range (0, inf).
dfd : array_like
Degrees of freedom of the denominator sum of squares. Range (0, inf).
nc : array_like
Noncentrality parameter. Should be in range (0, 1e4).
p : array_like
Value of the cumulative distribution function. Must be in the
range [0, 1].
Returns
-------
f : float
Quantiles, i.e. the upper limit of integration.
See Also
--------
ncfdtr : CDF of the non-central F distribution.
ncfdtridfd : Inverse of `ncfdtr` with respect to `dfd`.
ncfdtridfn : Inverse of `ncfdtr` with respect to `dfn`.
ncfdtrinc : Inverse of `ncfdtr` with respect to `nc`.
Examples
--------
>>> from scipy.special import ncfdtr, ncfdtri
Compute the CDF for several values of `f`:
>>> f = [0.5, 1, 1.5]
>>> p = ncfdtr(2, 3, 1.5, f)
>>> p
array([ 0.20782291, 0.36107392, 0.47345752])
Compute the inverse. We recover the values of `f`, as expected:
>>> ncfdtri(2, 3, 1.5, p)
array([ 0.5, 1. , 1.5])
""")
add_newdoc("scipy.special", "ncfdtridfd",
"""
ncfdtridfd(dfn, p, nc, f)
Calculate degrees of freedom (denominator) for the noncentral F-distribution.
This is the inverse with respect to `dfd` of `ncfdtr`.
See `ncfdtr` for more details.
Parameters
----------
dfn : array_like
Degrees of freedom of the numerator sum of squares. Range (0, inf).
p : array_like
Value of the cumulative distribution function. Must be in the
range [0, 1].
nc : array_like
Noncentrality parameter. Should be in range (0, 1e4).
f : array_like
Quantiles, i.e. the upper limit of integration.
Returns
-------
dfd : float
Degrees of freedom of the denominator sum of squares.
See Also
--------
ncfdtr : CDF of the non-central F distribution.
ncfdtri : Quantile function; inverse of `ncfdtr` with respect to `f`.
ncfdtridfn : Inverse of `ncfdtr` with respect to `dfn`.
ncfdtrinc : Inverse of `ncfdtr` with respect to `nc`.
Notes
-----
The value of the cumulative noncentral F distribution is not necessarily
monotone in either degrees of freedom. There thus may be two values that
provide a given CDF value. This routine assumes monotonicity and will
find an arbitrary one of the two values.
Examples
--------
>>> from scipy.special import ncfdtr, ncfdtridfd
Compute the CDF for several values of `dfd`:
>>> dfd = [1, 2, 3]
>>> p = ncfdtr(2, dfd, 0.25, 15)
>>> p
array([ 0.8097138 , 0.93020416, 0.96787852])
Compute the inverse. We recover the values of `dfd`, as expected:
>>> ncfdtridfd(2, p, 0.25, 15)
array([ 1., 2., 3.])
""")
add_newdoc("scipy.special", "ncfdtridfn",
"""
ncfdtridfn(p, dfd, nc, f)
Calculate degrees of freedom (numerator) for the noncentral F-distribution.
This is the inverse with respect to `dfn` of `ncfdtr`.
See `ncfdtr` for more details.
Parameters
----------
p : array_like
Value of the cumulative distribution function. Must be in the
range [0, 1].
dfd : array_like
Degrees of freedom of the denominator sum of squares. Range (0, inf).
nc : array_like
Noncentrality parameter. Should be in range (0, 1e4).
f : float
Quantiles, i.e. the upper limit of integration.
Returns
-------
dfn : float
Degrees of freedom of the numerator sum of squares.
See Also
--------
ncfdtr : CDF of the non-central F distribution.
ncfdtri : Quantile function; inverse of `ncfdtr` with respect to `f`.
ncfdtridfd : Inverse of `ncfdtr` with respect to `dfd`.
ncfdtrinc : Inverse of `ncfdtr` with respect to `nc`.
Notes
-----
The value of the cumulative noncentral F distribution is not necessarily
monotone in either degrees of freedom. There thus may be two values that
provide a given CDF value. This routine assumes monotonicity and will
find an arbitrary one of the two values.
Examples
--------
>>> from scipy.special import ncfdtr, ncfdtridfn
Compute the CDF for several values of `dfn`:
>>> dfn = [1, 2, 3]
>>> p = ncfdtr(dfn, 2, 0.25, 15)
>>> p
array([ 0.92562363, 0.93020416, 0.93188394])
Compute the inverse. We recover the values of `dfn`, as expected:
>>> ncfdtridfn(p, 2, 0.25, 15)
array([ 1., 2., 3.])
""")
add_newdoc("scipy.special", "ncfdtrinc",
"""
ncfdtrinc(dfn, dfd, p, f)
Calculate non-centrality parameter for non-central F distribution.
This is the inverse with respect to `nc` of `ncfdtr`.
See `ncfdtr` for more details.
Parameters
----------
dfn : array_like
Degrees of freedom of the numerator sum of squares. Range (0, inf).
dfd : array_like
Degrees of freedom of the denominator sum of squares. Range (0, inf).
p : array_like
Value of the cumulative distribution function. Must be in the
range [0, 1].
f : array_like
Quantiles, i.e. the upper limit of integration.
Returns
-------
nc : float
Noncentrality parameter.
See Also
--------
ncfdtr : CDF of the non-central F distribution.
ncfdtri : Quantile function; inverse of `ncfdtr` with respect to `f`.
ncfdtridfd : Inverse of `ncfdtr` with respect to `dfd`.
ncfdtridfn : Inverse of `ncfdtr` with respect to `dfn`.
Examples
--------
>>> from scipy.special import ncfdtr, ncfdtrinc
Compute the CDF for several values of `nc`:
>>> nc = [0.5, 1.5, 2.0]
>>> p = ncfdtr(2, 3, nc, 15)
>>> p
array([ 0.96309246, 0.94327955, 0.93304098])
Compute the inverse. We recover the values of `nc`, as expected:
>>> ncfdtrinc(2, 3, p, 15)
array([ 0.5, 1.5, 2. ])
""")
add_newdoc("scipy.special", "nctdtr",
"""
nctdtr(df, nc, t)
Cumulative distribution function of the non-central `t` distribution.
Parameters
----------
df : array_like
Degrees of freedom of the distribution. Should be in range (0, inf).
nc : array_like
Noncentrality parameter. Should be in range (-1e6, 1e6).
t : array_like
Quantiles, i.e. the upper limit of integration.
Returns
-------
cdf : float or ndarray
The calculated CDF. If all inputs are scalar, the return will be a
float. Otherwise it will be an array.
See Also
--------
nctdtrit : Inverse CDF (iCDF) of the non-central t distribution.
nctdtridf : Calculate degrees of freedom, given CDF and iCDF values.
nctdtrinc : Calculate non-centrality parameter, given CDF iCDF values.
Examples
--------
>>> from scipy import special
>>> from scipy import stats
>>> import matplotlib.pyplot as plt
Plot the CDF of the non-central t distribution, for nc=0. Compare with the
t-distribution from scipy.stats:
>>> x = np.linspace(-5, 5, num=500)
>>> df = 3
>>> nct_stats = stats.t.cdf(x, df)
>>> nct_special = special.nctdtr(df, 0, x)
>>> fig = plt.figure()
>>> ax = fig.add_subplot(111)
>>> ax.plot(x, nct_stats, 'b-', lw=3)
>>> ax.plot(x, nct_special, 'r-')
>>> plt.show()
""")
add_newdoc("scipy.special", "nctdtridf",
"""
nctdtridf(p, nc, t)
Calculate degrees of freedom for non-central t distribution.
See `nctdtr` for more details.
Parameters
----------
p : array_like
CDF values, in range (0, 1].
nc : array_like
Noncentrality parameter. Should be in range (-1e6, 1e6).
t : array_like
Quantiles, i.e. the upper limit of integration.
""")
add_newdoc("scipy.special", "nctdtrinc",
"""
nctdtrinc(df, p, t)
Calculate non-centrality parameter for non-central t distribution.
See `nctdtr` for more details.
Parameters
----------
df : array_like
Degrees of freedom of the distribution. Should be in range (0, inf).
p : array_like
CDF values, in range (0, 1].
t : array_like
Quantiles, i.e. the upper limit of integration.
""")
add_newdoc("scipy.special", "nctdtrit",
"""
nctdtrit(df, nc, p)
Inverse cumulative distribution function of the non-central t distribution.
See `nctdtr` for more details.
Parameters
----------
df : array_like
Degrees of freedom of the distribution. Should be in range (0, inf).
nc : array_like
Noncentrality parameter. Should be in range (-1e6, 1e6).
p : array_like
CDF values, in range (0, 1].
""")
add_newdoc("scipy.special", "ndtr",
r"""
ndtr(x)
Gaussian cumulative distribution function.
Returns the area under the standard Gaussian probability
density function, integrated from minus infinity to `x`
.. math::
\frac{1}{\sqrt{2\pi}} \int_{-\infty}^x \exp(-t^2/2) dt
Parameters
----------
x : array_like, real or complex
Argument
Returns
-------
ndarray
The value of the normal CDF evaluated at `x`
See Also
--------
erf
erfc
scipy.stats.norm
log_ndtr
""")
add_newdoc("scipy.special", "nrdtrimn",
"""
nrdtrimn(p, x, std)
Calculate mean of normal distribution given other params.
Parameters
----------
p : array_like
CDF values, in range (0, 1].
x : array_like
Quantiles, i.e. the upper limit of integration.
std : array_like
Standard deviation.
Returns
-------
mn : float or ndarray
The mean of the normal distribution.
See Also
--------
nrdtrimn, ndtr
""")
add_newdoc("scipy.special", "nrdtrisd",
"""
nrdtrisd(p, x, mn)
Calculate standard deviation of normal distribution given other params.
Parameters
----------
p : array_like
CDF values, in range (0, 1].
x : array_like
Quantiles, i.e. the upper limit of integration.
mn : float or ndarray
The mean of the normal distribution.
Returns
-------
std : array_like
Standard deviation.
See Also
--------
nrdtristd, ndtr
""")
add_newdoc("scipy.special", "log_ndtr",
"""
log_ndtr(x)
Logarithm of Gaussian cumulative distribution function.
Returns the log of the area under the standard Gaussian probability
density function, integrated from minus infinity to `x`::
log(1/sqrt(2*pi) * integral(exp(-t**2 / 2), t=-inf..x))
Parameters
----------
x : array_like, real or complex
Argument
Returns
-------
ndarray
The value of the log of the normal CDF evaluated at `x`
See Also
--------
erf
erfc
scipy.stats.norm
ndtr
""")
add_newdoc("scipy.special", "ndtri",
"""
ndtri(y)
Inverse of `ndtr` vs x
Returns the argument x for which the area under the Gaussian
probability density function (integrated from minus infinity to `x`)
is equal to y.
""")
add_newdoc("scipy.special", "obl_ang1",
"""
obl_ang1(m, n, c, x)
Oblate spheroidal angular function of the first kind and its derivative
Computes the oblate spheroidal angular function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "obl_ang1_cv",
"""
obl_ang1_cv(m, n, c, cv, x)
Oblate spheroidal angular function obl_ang1 for precomputed characteristic value
Computes the oblate spheroidal angular function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "obl_cv",
"""
obl_cv(m, n, c)
Characteristic value of oblate spheroidal function
Computes the characteristic value of oblate spheroidal wave
functions of order `m`, `n` (n>=m) and spheroidal parameter `c`.
""")
add_newdoc("scipy.special", "obl_rad1",
"""
obl_rad1(m, n, c, x)
Oblate spheroidal radial function of the first kind and its derivative
Computes the oblate spheroidal radial function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "obl_rad1_cv",
"""
obl_rad1_cv(m, n, c, cv, x)
Oblate spheroidal radial function obl_rad1 for precomputed characteristic value
Computes the oblate spheroidal radial function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "obl_rad2",
"""
obl_rad2(m, n, c, x)
Oblate spheroidal radial function of the second kind and its derivative.
Computes the oblate spheroidal radial function of the second kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "obl_rad2_cv",
"""
obl_rad2_cv(m, n, c, cv, x)
Oblate spheroidal radial function obl_rad2 for precomputed characteristic value
Computes the oblate spheroidal radial function of the second kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pbdv",
"""
pbdv(v, x)
Parabolic cylinder function D
Returns (d, dp) the parabolic cylinder function Dv(x) in d and the
derivative, Dv'(x) in dp.
Returns
-------
d
Value of the function
dp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pbvv",
"""
pbvv(v, x)
Parabolic cylinder function V
Returns the parabolic cylinder function Vv(x) in v and the
derivative, Vv'(x) in vp.
Returns
-------
v
Value of the function
vp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pbwa",
r"""
pbwa(a, x)
Parabolic cylinder function W.
The function is a particular solution to the differential equation
.. math::
y'' + \left(\frac{1}{4}x^2 - a\right)y = 0,
for a full definition see section 12.14 in [1]_.
Parameters
----------
a : array_like
Real parameter
x : array_like
Real argument
Returns
-------
w : scalar or ndarray
Value of the function
wp : scalar or ndarray
Value of the derivative in x
Notes
-----
The function is a wrapper for a Fortran routine by Zhang and Jin
[2]_. The implementation is accurate only for ``|a|, |x| < 5`` and
returns NaN outside that range.
References
----------
.. [1] Digital Library of Mathematical Functions, 14.30.
http://dlmf.nist.gov/14.30
.. [2] Zhang, Shanjie and Jin, Jianming. "Computation of Special
Functions", John Wiley and Sons, 1996.
https://people.sc.fsu.edu/~jburkardt/f_src/special_functions/special_functions.html
""")
add_newdoc("scipy.special", "pdtr",
"""
pdtr(k, m)
Poisson cumulative distribution function
Returns the sum of the first `k` terms of the Poisson distribution:
sum(exp(-m) * m**j / j!, j=0..k) = gammaincc( k+1, m). Arguments
must both be positive and `k` an integer.
""")
add_newdoc("scipy.special", "pdtrc",
"""
pdtrc(k, m)
Poisson survival function
Returns the sum of the terms from k+1 to infinity of the Poisson
distribution: sum(exp(-m) * m**j / j!, j=k+1..inf) = gammainc(
k+1, m). Arguments must both be positive and `k` an integer.
""")
add_newdoc("scipy.special", "pdtri",
"""
pdtri(k, y)
Inverse to `pdtr` vs m
Returns the Poisson variable `m` such that the sum from 0 to `k` of
the Poisson density is equal to the given probability `y`:
calculated by gammaincinv(k+1, y). `k` must be a nonnegative
integer and `y` between 0 and 1.
""")
add_newdoc("scipy.special", "pdtrik",
"""
pdtrik(p, m)
Inverse to `pdtr` vs k
Returns the quantile k such that ``pdtr(k, m) = p``
""")
add_newdoc("scipy.special", "poch",
r"""
poch(z, m)
Rising factorial (z)_m
The Pochhammer symbol (rising factorial), is defined as
.. math::
(z)_m = \frac{\Gamma(z + m)}{\Gamma(z)}
For positive integer `m` it reads
.. math::
(z)_m = z (z + 1) ... (z + m - 1)
Parameters
----------
z : array_like
(int or float)
m : array_like
(int or float)
Returns
-------
poch : ndarray
The value of the function.
""")
add_newdoc("scipy.special", "pro_ang1",
"""
pro_ang1(m, n, c, x)
Prolate spheroidal angular function of the first kind and its derivative
Computes the prolate spheroidal angular function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pro_ang1_cv",
"""
pro_ang1_cv(m, n, c, cv, x)
Prolate spheroidal angular function pro_ang1 for precomputed characteristic value
Computes the prolate spheroidal angular function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pro_cv",
"""
pro_cv(m, n, c)
Characteristic value of prolate spheroidal function
Computes the characteristic value of prolate spheroidal wave
functions of order `m`, `n` (n>=m) and spheroidal parameter `c`.
""")
add_newdoc("scipy.special", "pro_rad1",
"""
pro_rad1(m, n, c, x)
Prolate spheroidal radial function of the first kind and its derivative
Computes the prolate spheroidal radial function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pro_rad1_cv",
"""
pro_rad1_cv(m, n, c, cv, x)
Prolate spheroidal radial function pro_rad1 for precomputed characteristic value
Computes the prolate spheroidal radial function of the first kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pro_rad2",
"""
pro_rad2(m, n, c, x)
Prolate spheroidal radial function of the second kind and its derivative
Computes the prolate spheroidal radial function of the second kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pro_rad2_cv",
"""
pro_rad2_cv(m, n, c, cv, x)
Prolate spheroidal radial function pro_rad2 for precomputed characteristic value
Computes the prolate spheroidal radial function of the second kind
and its derivative (with respect to `x`) for mode parameters m>=0
and n>=m, spheroidal parameter `c` and ``|x| < 1.0``. Requires
pre-computed characteristic value.
Returns
-------
s
Value of the function
sp
Value of the derivative vs x
""")
add_newdoc("scipy.special", "pseudo_huber",
r"""
pseudo_huber(delta, r)
Pseudo-Huber loss function.
.. math:: \mathrm{pseudo\_huber}(\delta, r) = \delta^2 \left( \sqrt{ 1 + \left( \frac{r}{\delta} \right)^2 } - 1 \right)
Parameters
----------
delta : ndarray
Input array, indicating the soft quadratic vs. linear loss changepoint.
r : ndarray
Input array, possibly representing residuals.
Returns
-------
res : ndarray
The computed Pseudo-Huber loss function values.
Notes
-----
This function is convex in :math:`r`.
.. versionadded:: 0.15.0
""")
add_newdoc("scipy.special", "psi",
"""
psi(z, out=None)
The digamma function.
The logarithmic derivative of the gamma function evaluated at ``z``.
Parameters
----------
z : array_like
Real or complex argument.
out : ndarray, optional
Array for the computed values of ``psi``.
Returns
-------
digamma : ndarray
Computed values of ``psi``.
Notes
-----
For large values not close to the negative real axis ``psi`` is
computed using the asymptotic series (5.11.2) from [1]_. For small
arguments not close to the negative real axis the recurrence
relation (5.5.2) from [1]_ is used until the argument is large
enough to use the asymptotic series. For values close to the
negative real axis the reflection formula (5.5.4) from [1]_ is
used first. Note that ``psi`` has a family of zeros on the
negative real axis which occur between the poles at nonpositive
integers. Around the zeros the reflection formula suffers from
cancellation and the implementation loses precision. The sole
positive zero and the first negative zero, however, are handled
separately by precomputing series expansions using [2]_, so the
function should maintain full accuracy around the origin.
References
----------
.. [1] NIST Digital Library of Mathematical Functions
http://dlmf.nist.gov/5
.. [2] Fredrik Johansson and others.
"mpmath: a Python library for arbitrary-precision floating-point arithmetic"
(Version 0.19) http://mpmath.org/
""")
add_newdoc("scipy.special", "radian",
"""
radian(d, m, s)
Convert from degrees to radians
Returns the angle given in (d)egrees, (m)inutes, and (s)econds in
radians.
""")
add_newdoc("scipy.special", "rel_entr",
r"""
rel_entr(x, y)
Elementwise function for computing relative entropy.
.. math:: \mathrm{rel\_entr}(x, y) = \begin{cases} x \log(x / y) & x > 0, y > 0 \\ 0 & x = 0, y \ge 0 \\ \infty & \text{otherwise} \end{cases}
Parameters
----------
x : ndarray
First input array.
y : ndarray
Second input array.
Returns
-------
res : ndarray
Output array.
See Also
--------
entr, kl_div
Notes
-----
This function is jointly convex in x and y.
.. versionadded:: 0.15.0
""")
add_newdoc("scipy.special", "rgamma",
"""
rgamma(z)
Gamma function inverted
Returns ``1/gamma(x)``
""")
add_newdoc("scipy.special", "round",
"""
round(x)
Round to nearest integer
Returns the nearest integer to `x` as a double precision floating
point result. If `x` ends in 0.5 exactly, the nearest even integer
is chosen.
""")
add_newdoc("scipy.special", "shichi",
r"""
shichi(x, out=None)
Hyperbolic sine and cosine integrals.
The hyperbolic sine integral is
.. math::
\int_0^x \frac{\sinh{t}}{t}dt
and the hyperbolic cosine integral is
.. math::
\gamma + \log(x) + \int_0^x \frac{\cosh{t} - 1}{t} dt
where :math:`\gamma` is Euler's constant and :math:`\log` is the
principle branch of the logarithm.
Parameters
----------
x : array_like
Real or complex points at which to compute the hyperbolic sine
and cosine integrals.
Returns
-------
si : ndarray
Hyperbolic sine integral at ``x``
ci : ndarray
Hyperbolic cosine integral at ``x``
Notes
-----
For real arguments with ``x < 0``, ``chi`` is the real part of the
hyperbolic cosine integral. For such points ``chi(x)`` and ``chi(x
+ 0j)`` differ by a factor of ``1j*pi``.
For real arguments the function is computed by calling Cephes'
[1]_ *shichi* routine. For complex arguments the algorithm is based
on Mpmath's [2]_ *shi* and *chi* routines.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Fredrik Johansson and others.
"mpmath: a Python library for arbitrary-precision floating-point arithmetic"
(Version 0.19) http://mpmath.org/
""")
add_newdoc("scipy.special", "sici",
r"""
sici(x, out=None)
Sine and cosine integrals.
The sine integral is
.. math::
\int_0^x \frac{\sin{t}}{t}dt
and the cosine integral is
.. math::
\gamma + \log(x) + \int_0^x \frac{\cos{t} - 1}{t}dt
where :math:`\gamma` is Euler's constant and :math:`\log` is the
principle branch of the logarithm.
Parameters
----------
x : array_like
Real or complex points at which to compute the sine and cosine
integrals.
Returns
-------
si : ndarray
Sine integral at ``x``
ci : ndarray
Cosine integral at ``x``
Notes
-----
For real arguments with ``x < 0``, ``ci`` is the real part of the
cosine integral. For such points ``ci(x)`` and ``ci(x + 0j)``
differ by a factor of ``1j*pi``.
For real arguments the function is computed by calling Cephes'
[1]_ *sici* routine. For complex arguments the algorithm is based
on Mpmath's [2]_ *si* and *ci* routines.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
.. [2] Fredrik Johansson and others.
"mpmath: a Python library for arbitrary-precision floating-point arithmetic"
(Version 0.19) http://mpmath.org/
""")
add_newdoc("scipy.special", "sindg",
"""
sindg(x)
Sine of angle given in degrees
""")
add_newdoc("scipy.special", "smirnov",
"""
smirnov(n, e)
Kolmogorov-Smirnov complementary cumulative distribution function
Returns the exact Kolmogorov-Smirnov complementary cumulative
distribution function (Dn+ or Dn-) for a one-sided test of
equality between an empirical and a theoretical distribution. It
is equal to the probability that the maximum difference between a
theoretical distribution and an empirical one based on `n` samples
is greater than e.
""")
add_newdoc("scipy.special", "smirnovi",
"""
smirnovi(n, y)
Inverse to `smirnov`
Returns ``e`` such that ``smirnov(n, e) = y``.
""")
add_newdoc("scipy.special", "spence",
r"""
spence(z, out=None)
Spence's function, also known as the dilogarithm.
It is defined to be
.. math::
\int_0^z \frac{\log(t)}{1 - t}dt
for complex :math:`z`, where the contour of integration is taken
to avoid the branch cut of the logarithm. Spence's function is
analytic everywhere except the negative real axis where it has a
branch cut.
Parameters
----------
z : array_like
Points at which to evaluate Spence's function
Returns
-------
s : ndarray
Computed values of Spence's function
Notes
-----
There is a different convention which defines Spence's function by
the integral
.. math::
-\int_0^z \frac{\log(1 - t)}{t}dt;
this is our ``spence(1 - z)``.
""")
add_newdoc("scipy.special", "stdtr",
"""
stdtr(df, t)
Student t distribution cumulative density function
Returns the integral from minus infinity to t of the Student t
distribution with df > 0 degrees of freedom::
gamma((df+1)/2)/(sqrt(df*pi)*gamma(df/2)) *
integral((1+x**2/df)**(-df/2-1/2), x=-inf..t)
""")
add_newdoc("scipy.special", "stdtridf",
"""
stdtridf(p, t)
Inverse of `stdtr` vs df
Returns the argument df such that stdtr(df, t) is equal to `p`.
""")
add_newdoc("scipy.special", "stdtrit",
"""
stdtrit(df, p)
Inverse of `stdtr` vs `t`
Returns the argument `t` such that stdtr(df, t) is equal to `p`.
""")
add_newdoc("scipy.special", "struve",
r"""
struve(v, x)
Struve function.
Return the value of the Struve function of order `v` at `x`. The Struve
function is defined as,
.. math::
H_v(x) = (z/2)^{v + 1} \sum_{n=0}^\infty \frac{(-1)^n (z/2)^{2n}}{\Gamma(n + \frac{3}{2}) \Gamma(n + v + \frac{3}{2})},
where :math:`\Gamma` is the gamma function.
Parameters
----------
v : array_like
Order of the Struve function (float).
x : array_like
Argument of the Struve function (float; must be positive unless `v` is
an integer).
Returns
-------
H : ndarray
Value of the Struve function of order `v` at `x`.
Notes
-----
Three methods discussed in [1]_ are used to evaluate the Struve function:
- power series
- expansion in Bessel functions (if :math:`|z| < |v| + 20`)
- asymptotic large-z expansion (if :math:`z \geq 0.7v + 12`)
Rounding errors are estimated based on the largest terms in the sums, and
the result associated with the smallest error is returned.
See also
--------
modstruve
References
----------
.. [1] NIST Digital Library of Mathematical Functions
http://dlmf.nist.gov/11
""")
add_newdoc("scipy.special", "tandg",
"""
tandg(x)
Tangent of angle x given in degrees.
""")
add_newdoc("scipy.special", "tklmbda",
"""
tklmbda(x, lmbda)
Tukey-Lambda cumulative distribution function
""")
add_newdoc("scipy.special", "wofz",
"""
wofz(z)
Faddeeva function
Returns the value of the Faddeeva function for complex argument::
exp(-z**2) * erfc(-i*z)
See Also
--------
dawsn, erf, erfc, erfcx, erfi
References
----------
.. [1] Steven G. Johnson, Faddeeva W function implementation.
http://ab-initio.mit.edu/Faddeeva
Examples
--------
>>> from scipy import special
>>> import matplotlib.pyplot as plt
>>> x = np.linspace(-3, 3)
>>> z = special.wofz(x)
>>> plt.plot(x, z.real, label='wofz(x).real')
>>> plt.plot(x, z.imag, label='wofz(x).imag')
>>> plt.xlabel('$x$')
>>> plt.legend(framealpha=1, shadow=True)
>>> plt.grid(alpha=0.25)
>>> plt.show()
""")
add_newdoc("scipy.special", "xlogy",
"""
xlogy(x, y)
Compute ``x*log(y)`` so that the result is 0 if ``x = 0``.
Parameters
----------
x : array_like
Multiplier
y : array_like
Argument
Returns
-------
z : array_like
Computed x*log(y)
Notes
-----
.. versionadded:: 0.13.0
""")
add_newdoc("scipy.special", "xlog1py",
"""
xlog1py(x, y)
Compute ``x*log1p(y)`` so that the result is 0 if ``x = 0``.
Parameters
----------
x : array_like
Multiplier
y : array_like
Argument
Returns
-------
z : array_like
Computed x*log1p(y)
Notes
-----
.. versionadded:: 0.13.0
""")
add_newdoc("scipy.special", "y0",
r"""
y0(x)
Bessel function of the second kind of order 0.
Parameters
----------
x : array_like
Argument (float).
Returns
-------
Y : ndarray
Value of the Bessel function of the second kind of order 0 at `x`.
Notes
-----
The domain is divided into the intervals [0, 5] and (5, infinity). In the
first interval a rational approximation :math:`R(x)` is employed to
compute,
.. math::
Y_0(x) = R(x) + \frac{2 \log(x) J_0(x)}{\pi},
where :math:`J_0` is the Bessel function of the first kind of order 0.
In the second interval, the Hankel asymptotic expansion is employed with
two rational functions of degree 6/6 and 7/7.
This function is a wrapper for the Cephes [1]_ routine `y0`.
See also
--------
j0
yv
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "y1",
"""
y1(x)
Bessel function of the second kind of order 1.
Parameters
----------
x : array_like
Argument (float).
Returns
-------
Y : ndarray
Value of the Bessel function of the second kind of order 1 at `x`.
Notes
-----
The domain is divided into the intervals [0, 8] and (8, infinity). In the
first interval a 25 term Chebyshev expansion is used, and computing
:math:`J_1` (the Bessel function of the first kind) is required. In the
second, the asymptotic trigonometric representation is employed using two
rational functions of degree 5/5.
This function is a wrapper for the Cephes [1]_ routine `y1`.
See also
--------
j1
yn
yv
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "yn",
r"""
yn(n, x)
Bessel function of the second kind of integer order and real argument.
Parameters
----------
n : array_like
Order (integer).
z : array_like
Argument (float).
Returns
-------
Y : ndarray
Value of the Bessel function, :math:`Y_n(x)`.
Notes
-----
Wrapper for the Cephes [1]_ routine `yn`.
The function is evaluated by forward recurrence on `n`, starting with
values computed by the Cephes routines `y0` and `y1`. If `n = 0` or 1,
the routine for `y0` or `y1` is called directly.
See also
--------
yv : For real order and real or complex argument.
References
----------
.. [1] Cephes Mathematical Functions Library,
http://www.netlib.org/cephes/index.html
""")
add_newdoc("scipy.special", "yv",
r"""
yv(v, z)
Bessel function of the second kind of real order and complex argument.
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
Y : ndarray
Value of the Bessel function of the second kind, :math:`Y_v(x)`.
Notes
-----
For positive `v` values, the computation is carried out using the
AMOS [1]_ `zbesy` routine, which exploits the connection to the Hankel
Bessel functions :math:`H_v^{(1)}` and :math:`H_v^{(2)}`,
.. math:: Y_v(z) = \frac{1}{2\imath} (H_v^{(1)} - H_v^{(2)}).
For negative `v` values the formula,
.. math:: Y_{-v}(z) = Y_v(z) \cos(\pi v) + J_v(z) \sin(\pi v)
is used, where :math:`J_v(z)` is the Bessel function of the first kind,
computed using the AMOS routine `zbesj`. Note that the second term is
exactly zero for integer `v`; to improve accuracy the second term is
explicitly omitted for `v` values such that `v = floor(v)`.
See also
--------
yve : :math:`Y_v` with leading exponential behavior stripped off.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "yve",
r"""
yve(v, z)
Exponentially scaled Bessel function of the second kind of real order.
Returns the exponentially scaled Bessel function of the second
kind of real order `v` at complex `z`::
yve(v, z) = yv(v, z) * exp(-abs(z.imag))
Parameters
----------
v : array_like
Order (float).
z : array_like
Argument (float or complex).
Returns
-------
Y : ndarray
Value of the exponentially scaled Bessel function.
Notes
-----
For positive `v` values, the computation is carried out using the
AMOS [1]_ `zbesy` routine, which exploits the connection to the Hankel
Bessel functions :math:`H_v^{(1)}` and :math:`H_v^{(2)}`,
.. math:: Y_v(z) = \frac{1}{2\imath} (H_v^{(1)} - H_v^{(2)}).
For negative `v` values the formula,
.. math:: Y_{-v}(z) = Y_v(z) \cos(\pi v) + J_v(z) \sin(\pi v)
is used, where :math:`J_v(z)` is the Bessel function of the first kind,
computed using the AMOS routine `zbesj`. Note that the second term is
exactly zero for integer `v`; to improve accuracy the second term is
explicitly omitted for `v` values such that `v = floor(v)`.
References
----------
.. [1] Donald E. Amos, "AMOS, A Portable Package for Bessel Functions
of a Complex Argument and Nonnegative Order",
http://netlib.org/amos/
""")
add_newdoc("scipy.special", "_zeta",
"""
_zeta(x, q)
Internal function, Hurwitz zeta.
""")
add_newdoc("scipy.special", "zetac",
"""
zetac(x)
Riemann zeta function minus 1.
This function is defined as
.. math:: \\zeta(x) = \\sum_{k=2}^{\\infty} 1 / k^x,
where ``x > 1``. For ``x < 1``, the analytic continuation is computed.
Because of limitations of the numerical algorithm, ``zetac(x)`` returns
`nan` for `x` less than -30.8148.
Parameters
----------
x : array_like of float
Values at which to compute zeta(x) - 1 (must be real).
Returns
-------
out : array_like
Values of zeta(x) - 1.
See Also
--------
zeta
Examples
--------
>>> from scipy.special import zetac, zeta
Some special values:
>>> zetac(2), np.pi**2/6 - 1
(0.64493406684822641, 0.6449340668482264)
>>> zetac(-1), -1.0/12 - 1
(-1.0833333333333333, -1.0833333333333333)
Compare ``zetac(x)`` to ``zeta(x) - 1`` for large `x`:
>>> zetac(60), zeta(60) - 1
(8.673617380119933e-19, 0.0)
""")
add_newdoc("scipy.special", "_struve_asymp_large_z",
"""
_struve_asymp_large_z(v, z, is_h)
Internal function for testing `struve` & `modstruve`
Evaluates using asymptotic expansion
Returns
-------
v, err
""")
add_newdoc("scipy.special", "_struve_power_series",
"""
_struve_power_series(v, z, is_h)
Internal function for testing `struve` & `modstruve`
Evaluates using power series
Returns
-------
v, err
""")
add_newdoc("scipy.special", "_struve_bessel_series",
"""
_struve_bessel_series(v, z, is_h)
Internal function for testing `struve` & `modstruve`
Evaluates using Bessel function series
Returns
-------
v, err
""")
add_newdoc("scipy.special", "_spherical_jn",
"""
Internal function, use `spherical_jn` instead.
""")
add_newdoc("scipy.special", "_spherical_jn_d",
"""
Internal function, use `spherical_jn` instead.
""")
add_newdoc("scipy.special", "_spherical_yn",
"""
Internal function, use `spherical_yn` instead.
""")
add_newdoc("scipy.special", "_spherical_yn_d",
"""
Internal function, use `spherical_yn` instead.
""")
add_newdoc("scipy.special", "_spherical_in",
"""
Internal function, use `spherical_in` instead.
""")
add_newdoc("scipy.special", "_spherical_in_d",
"""
Internal function, use `spherical_in` instead.
""")
add_newdoc("scipy.special", "_spherical_kn",
"""
Internal function, use `spherical_kn` instead.
""")
add_newdoc("scipy.special", "_spherical_kn_d",
"""
Internal function, use `spherical_kn` instead.
""")
add_newdoc("scipy.special", "loggamma",
r"""
loggamma(z, out=None)
Principal branch of the logarithm of the Gamma function.
Defined to be :math:`\log(\Gamma(x))` for :math:`x > 0` and
extended to the complex plane by analytic continuation. The
function has a single branch cut on the negative real axis.
.. versionadded:: 0.18.0
Parameters
----------
z : array-like
Values in the complex plain at which to compute ``loggamma``
out : ndarray, optional
Output array for computed values of ``loggamma``
Returns
-------
loggamma : ndarray
Values of ``loggamma`` at z.
Notes
-----
It is not generally true that :math:`\log\Gamma(z) =
\log(\Gamma(z))`, though the real parts of the functions do
agree. The benefit of not defining ``loggamma`` as
:math:`\log(\Gamma(z))` is that the latter function has a
complicated branch cut structure whereas ``loggamma`` is analytic
except for on the negative real axis.
The identities
.. math::
\exp(\log\Gamma(z)) &= \Gamma(z) \\
\log\Gamma(z + 1) &= \log(z) + \log\Gamma(z)
make ``loggama`` useful for working in complex logspace. However,
``loggamma`` necessarily returns complex outputs for real inputs,
so if you want to work only with real numbers use `gammaln`. On
the real line the two functions are related by ``exp(loggamma(x))
= gammasgn(x)*exp(gammaln(x))``, though in practice rounding
errors will introduce small spurious imaginary components in
``exp(loggamma(x))``.
The implementation here is based on [hare1997]_.
See also
--------
gammaln : logarithm of the absolute value of the Gamma function
gammasgn : sign of the gamma function
References
----------
.. [hare1997] D.E.G. Hare,
*Computing the Principal Branch of log-Gamma*,
Journal of Algorithms, Volume 25, Issue 2, November 1997, pages 221-236.
""")
add_newdoc("scipy.special", "_sinpi",
"""
Internal function, do not use.
""")
add_newdoc("scipy.special", "_cospi",
"""
Internal function, do not use.
""")
add_newdoc("scipy.special", "owens_t",
"""
owens_t(h, a)
Owen's T Function.
The function T(h, a) gives the probability of the event
(X > h and 0 < Y < a * X) where X and Y are independent
standard normal random variables.
Parameters
----------
h: array_like
Input value.
a: array_like
Input value.
Returns
-------
t: scalar or ndarray
Probability of the event (X > h and 0 < Y < a * X),
where X and Y are independent standard normal random variables.
Examples
--------
>>> from scipy import special
>>> a = 3.5
>>> h = 0.78
>>> special.owens_t(h, a)
0.10877216734852274
References
----------
.. [1] M. Patefield and D. Tandy, "Fast and accurate calculation of
Owen's T Function", Statistical Software vol. 5, pp. 1-25, 2000.
""")
Reference in a new issue Copy permalink