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''' 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)
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