laywerrobot/lib/python3.6/site-packages/scipy/io/tests/test_fortran.py
2020-08-27 21:55:39 +02:00

159 lines
4.9 KiB
Python

''' Tests for fortran sequential files '''
import tempfile
import shutil
from os import path, unlink
from glob import iglob
import re
from numpy.testing import assert_equal, assert_allclose
import numpy as np
from scipy.io import FortranFile, _test_fortran
DATA_PATH = path.join(path.dirname(__file__), 'data')
def test_fortranfiles_read():
for filename in iglob(path.join(DATA_PATH, "fortran-*-*x*x*.dat")):
m = re.search(r'fortran-([^-]+)-(\d+)x(\d+)x(\d+).dat', filename, re.I)
if not m:
raise RuntimeError("Couldn't match %s filename to regex" % filename)
dims = (int(m.group(2)), int(m.group(3)), int(m.group(4)))
dtype = m.group(1).replace('s', '<')
f = FortranFile(filename, 'r', '<u4')
data = f.read_record(dtype=dtype).reshape(dims, order='F')
f.close()
expected = np.arange(np.prod(dims)).reshape(dims).astype(dtype)
assert_equal(data, expected)
def test_fortranfiles_mixed_record():
filename = path.join(DATA_PATH, "fortran-mixed.dat")
with FortranFile(filename, 'r', '<u4') as f:
record = f.read_record('<i4,<f4,<i8,(2)<f8')
assert_equal(record['f0'][0], 1)
assert_allclose(record['f1'][0], 2.3)
assert_equal(record['f2'][0], 4)
assert_allclose(record['f3'][0], [5.6, 7.8])
def test_fortranfiles_write():
for filename in iglob(path.join(DATA_PATH, "fortran-*-*x*x*.dat")):
m = re.search(r'fortran-([^-]+)-(\d+)x(\d+)x(\d+).dat', filename, re.I)
if not m:
raise RuntimeError("Couldn't match %s filename to regex" % filename)
dims = (int(m.group(2)), int(m.group(3)), int(m.group(4)))
dtype = m.group(1).replace('s', '<')
data = np.arange(np.prod(dims)).reshape(dims).astype(dtype)
tmpdir = tempfile.mkdtemp()
try:
testFile = path.join(tmpdir,path.basename(filename))
f = FortranFile(testFile, 'w','<u4')
f.write_record(data.T)
f.close()
originalfile = open(filename, 'rb')
newfile = open(testFile, 'rb')
assert_equal(originalfile.read(), newfile.read(),
err_msg=filename)
originalfile.close()
newfile.close()
finally:
shutil.rmtree(tmpdir)
def test_fortranfile_read_mixed_record():
# The data file fortran-3x3d-2i.dat contains the program that
# produced it at the end.
#
# double precision :: a(3,3)
# integer :: b(2)
# ...
# open(1, file='fortran-3x3d-2i.dat', form='unformatted')
# write(1) a, b
# close(1)
#
filename = path.join(DATA_PATH, "fortran-3x3d-2i.dat")
with FortranFile(filename, 'r', '<u4') as f:
record = f.read_record('(3,3)f8', '2i4')
ax = np.arange(3*3).reshape(3, 3).astype(np.double)
bx = np.array([-1, -2], dtype=np.int32)
assert_equal(record[0], ax.T)
assert_equal(record[1], bx.T)
def test_fortranfile_write_mixed_record(tmpdir):
tf = path.join(str(tmpdir), 'test.dat')
records = [
(('f4', 'f4', 'i4'), (np.float32(2), np.float32(3), np.int32(100))),
(('4f4', '(3,3)f4', '8i4'), (np.random.randint(255, size=[4]).astype(np.float32),
np.random.randint(255, size=[3, 3]).astype(np.float32),
np.random.randint(255, size=[8]).astype(np.int32)))
]
for dtype, a in records:
with FortranFile(tf, 'w') as f:
f.write_record(*a)
with FortranFile(tf, 'r') as f:
b = f.read_record(*dtype)
assert_equal(len(a), len(b))
for aa, bb in zip(a, b):
assert_equal(bb, aa)
def test_fortran_roundtrip(tmpdir):
filename = path.join(str(tmpdir), 'test.dat')
np.random.seed(1)
# double precision
m, n, k = 5, 3, 2
a = np.random.randn(m, n, k)
with FortranFile(filename, 'w') as f:
f.write_record(a.T)
a2 = _test_fortran.read_unformatted_double(m, n, k, filename)
with FortranFile(filename, 'r') as f:
a3 = f.read_record('(2,3,5)f8').T
assert_equal(a2, a)
assert_equal(a3, a)
# integer
m, n, k = 5, 3, 2
a = np.random.randn(m, n, k).astype(np.int32)
with FortranFile(filename, 'w') as f:
f.write_record(a.T)
a2 = _test_fortran.read_unformatted_int(m, n, k, filename)
with FortranFile(filename, 'r') as f:
a3 = f.read_record('(2,3,5)i4').T
assert_equal(a2, a)
assert_equal(a3, a)
# mixed
m, n, k = 5, 3, 2
a = np.random.randn(m, n)
b = np.random.randn(k).astype(np.intc)
with FortranFile(filename, 'w') as f:
f.write_record(a.T, b.T)
a2, b2 = _test_fortran.read_unformatted_mixed(m, n, k, filename)
with FortranFile(filename, 'r') as f:
a3, b3 = f.read_record('(3,5)f8', '2i4')
a3 = a3.T
assert_equal(a2, a)
assert_equal(a3, a)
assert_equal(b2, b)
assert_equal(b3, b)