def test_stretch():
arr = np.empty(5,
dtype=[
('scalar', np.int),
('vl1', 'O'),
('vl2', 'O'),
('vl3', 'O'),
('fl1', np.int, (2, 2)),
('fl2', np.float, (2, 3)),
('fl3', np.double, (3, 2))])
for i in range(arr.shape[0]):
vl1 = np.array(range(i + 1), dtype=np.int)
vl2 = np.array(range(i + 2), dtype=np.float) * 2
vl3 = np.array(range(2), dtype=np.double) * 3
fl1 = np.array(range(4), dtype=np.int).reshape((2, 2))
fl2 = np.array(range(6), dtype=np.float).reshape((2, 3))
fl3 = np.array(range(6), dtype=np.double).reshape((3, 2))
arr[i] = (i, vl1, vl2, vl3, fl1, fl2, fl3)
# no array columns included
assert_raises(RuntimeError, rnp.stretch, arr, ['scalar',])
# lengths don't match
assert_raises(ValueError, rnp.stretch, arr, ['scalar', 'vl1', 'vl2',])
assert_raises(ValueError, rnp.stretch, arr, ['scalar', 'fl1', 'fl3',])
assert_raises(ValueError, rnp.stretch, arr)
# variable-length stretch
stretched = rnp.stretch(arr, ['scalar', 'vl1',])
assert_equal(stretched.dtype,
[('scalar', np.int),
('vl1', np.int)])
assert_equal(stretched.shape[0], 15)
assert_array_equal(
stretched['scalar'],
np.repeat(arr['scalar'], np.vectorize(len)(arr['vl1'])))
# fixed-length stretch
stretched = rnp.stretch(arr, ['scalar', 'vl3', 'fl1', 'fl2',])
assert_equal(stretched.dtype,
[('scalar', np.int),
('vl3', np.double),
('fl1', np.int, (2,)),
('fl2', np.float, (3,))])
assert_equal(stretched.shape[0], 10)
assert_array_equal(
stretched['scalar'], np.repeat(arr['scalar'], 2))
# optional argument return_indices
stretched, idx = rnp.stretch(arr, ['scalar', 'vl1'], return_indices=True)
assert_equal(stretched.shape[0], idx.shape[0])
from_arr = list(map(lambda x: x['vl1'][0], arr))
from_stretched = stretched[idx == 0]['vl1']
assert_array_equal(from_arr, from_stretched)
# stretch single field and produce unstructured output
stretched = rnp.stretch(arr, 'vl1')
assert_equal(stretched.dtype, np.int)
def test_stretch():
arr = np.empty(5,
dtype=[
('scalar', np.int),
('vl1', 'O'),
('vl2', 'O'),
('vl3', 'O'),
('fl1', np.int, (2, 2)),
('fl2', np.float, (2, 3)),
('fl3', np.double, (3, 2))])
for i in range(arr.shape[0]):
vl1 = np.array(range(i + 1), dtype=np.int)
vl2 = np.array(range(i + 2), dtype=np.float) * 2
vl3 = np.array(range(2), dtype=np.double) * 3
fl1 = np.array(range(4), dtype=np.int).reshape((2, 2))
fl2 = np.array(range(6), dtype=np.float).reshape((2, 3))
fl3 = np.array(range(6), dtype=np.double).reshape((3, 2))
arr[i] = (i, vl1, vl2, vl3, fl1, fl2, fl3)
# no array columns included
assert_raises(RuntimeError, rnp.stretch, arr, ['scalar',])
# lengths don't match
assert_raises(ValueError, rnp.stretch, arr, ['scalar', 'vl1', 'vl2',])
assert_raises(ValueError, rnp.stretch, arr, ['scalar', 'fl1', 'fl3',])
assert_raises(ValueError, rnp.stretch, arr)
# variable-length stretch
stretched = rnp.stretch(arr, ['scalar', 'vl1',])
assert_equal(stretched.dtype,
[('scalar', np.int),
('vl1', np.int)])
assert_equal(stretched.shape[0], 15)
assert_array_equal(
stretched['scalar'],
np.repeat(arr['scalar'], np.vectorize(len)(arr['vl1'])))
# fixed-length stretch
stretched = rnp.stretch(arr, ['scalar', 'vl3', 'fl1', 'fl2',])
assert_equal(stretched.dtype,
[('scalar', np.int),
('vl3', np.double),
('fl1', np.int, (2,)),
('fl2', np.float, (3,))])
assert_equal(stretched.shape[0], 10)
assert_array_equal(
stretched['scalar'], np.repeat(arr['scalar'], 2))
def test_stretch():
nrec = 5
arr = np.empty(nrec,
dtype=[
('scalar', np.int),
('df1', 'O'),
('df2', 'O'),
('df3', 'O')])
for i in xrange(nrec):
df1 = np.array(range(i + 1), dtype=np.float)
df2 = np.array(range(i + 1), dtype=np.int) * 2
df3 = np.array(range(i + 1), dtype=np.double) * 3
arr[i] = (i, df1, df2, df3)
stretched = rnp.stretch(
arr, ['scalar', 'df1', 'df2', 'df3'])
assert_equal(stretched.dtype,
[('scalar', np.int),
('df1', np.float),
('df2', np.int),
('df3', np.double)])
assert_equal(stretched.size, 15)
assert_almost_equal(stretched['df1'][14], 4.0)
assert_almost_equal(stretched['df2'][14], 8)
assert_almost_equal(stretched['df3'][14], 12.0)
assert_almost_equal(stretched['scalar'][14], 4)
assert_almost_equal(stretched['scalar'][13], 4)
assert_almost_equal(stretched['scalar'][12], 4)
assert_almost_equal(stretched['scalar'][11], 4)
assert_almost_equal(stretched['scalar'][10], 4)
assert_almost_equal(stretched['scalar'][9], 3)
arr = np.empty(1, dtype=[('scalar', np.int),])
arr[0] = (1,)
assert_raises(RuntimeError, rnp.stretch, arr, ['scalar',])
nrec = 5
arr = np.empty(nrec,
dtype=[
('scalar', np.int),
('df1', 'O'),
('df2', 'O')])
for i in xrange(nrec):
df1 = np.array(range(i + 1), dtype=np.float)
df2 = np.array(range(i + 2), dtype=np.int) * 2
arr[i] = (i, df1, df2)
assert_raises(ValueError, rnp.stretch, arr, ['scalar', 'df1', 'df2'])