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# mode: run
# tag: numpy
cimport cython
from cython.view cimport array
import numpy as np
cimport numpy as np
def test_shape_stride_suboffset():
u'''
>>> test_shape_stride_suboffset()
5 7 11
77 11 1
-1 -1 -1
<BLANKLINE>
5 7 11
1 5 35
-1 -1 -1
<BLANKLINE>
5 7 11
77 11 1
-1 -1 -1
'''
cdef char[:,:,:] larr = array((5,7,11), 1, 'c')
print larr.shape[0], larr.shape[1], larr.shape[2]
print larr.strides[0], larr.strides[1], larr.strides[2]
print larr.suboffsets[0], larr.suboffsets[1], larr.suboffsets[2]
print
larr = array((5,7,11), 1, 'c', mode='fortran')
print larr.shape[0], larr.shape[1], larr.shape[2]
print larr.strides[0], larr.strides[1], larr.strides[2]
print larr.suboffsets[0], larr.suboffsets[1], larr.suboffsets[2]
print
cdef char[:,:,:] c_contig = larr.copy()
print c_contig.shape[0], c_contig.shape[1], c_contig.shape[2]
print c_contig.strides[0], c_contig.strides[1], c_contig.strides[2]
print c_contig.suboffsets[0], c_contig.suboffsets[1], c_contig.suboffsets[2]
def test_copy_to():
u'''
>>> test_copy_to()
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
'''
cdef int[:, :, :] from_mvs, to_mvs
from_mvs = np.arange(8, dtype=np.int32).reshape(2,2,2)
cdef int *from_data = <int *> from_mvs._data
print ' '.join(str(from_data[i]) for i in range(2*2*2))
to_mvs = array((2,2,2), sizeof(int), 'i')
to_mvs[...] = from_mvs
# TODO Mark: remove this _data attribute
cdef int *to_data = <int*>to_mvs._data
print ' '.join(str(from_data[i]) for i in range(2*2*2))
print ' '.join(str(to_data[i]) for i in range(2*2*2))
def test_overlapping_copy():
"""
>>> test_overlapping_copy()
"""
cdef int i, array[10]
for i in range(10):
array[i] = i
cdef int[:] slice = array
slice[...] = slice[::-1]
for i in range(10):
assert slice[i] == 10 - 1 - i
def test_copy_return_type():
"""
>>> test_copy_return_type()
60.0
60.0
"""
cdef double[:, :, :] a = np.arange(5 * 5 * 5, dtype=np.float64).reshape(5, 5, 5)
cdef double[:, ::1] c_contig = a[..., 0].copy()
cdef double[::1, :] f_contig = a[..., 0].copy_fortran()
print(c_contig[2, 2])
print(f_contig[2, 2])
def test_partly_overlapping():
"""
>>> test_partly_overlapping()
"""
cdef int i, array[10]
for i in range(10):
array[i] = i
cdef int[:] slice = array
cdef int[:] slice2 = slice[:5]
slice2[...] = slice[4:9]
for i in range(5):
assert slice2[i] == i + 4
@cython.nonecheck(True)
def test_nonecheck1():
u'''
>>> test_nonecheck1()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'uninitialized' referenced before assignment
'''
cdef int[:,:,:] uninitialized
print uninitialized.is_c_contig()
@cython.nonecheck(True)
def test_nonecheck2():
u'''
>>> test_nonecheck2()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'uninitialized' referenced before assignment
'''
cdef int[:,:,:] uninitialized
print uninitialized.is_f_contig()
@cython.nonecheck(True)
def test_nonecheck3():
u'''
>>> test_nonecheck3()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'uninitialized' referenced before assignment
'''
cdef int[:,:,:] uninitialized
uninitialized.copy()
@cython.nonecheck(True)
def test_nonecheck4():
u'''
>>> test_nonecheck4()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'uninitialized' referenced before assignment
'''
cdef int[:,:,:] uninitialized
uninitialized.copy_fortran()
@cython.nonecheck(True)
def test_nonecheck5():
u'''
>>> test_nonecheck5()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'uninitialized' referenced before assignment
'''
cdef int[:,:,:] uninitialized
uninitialized._data
def test_copy_mismatch():
u'''
>>> test_copy_mismatch()
Traceback (most recent call last):
...
ValueError: got differing extents in dimension 0 (got 2 and 3)
'''
cdef int[:,:,::1] mv1 = array((2,2,3), sizeof(int), 'i')
cdef int[:,:,::1] mv2 = array((3,2,3), sizeof(int), 'i')
mv1[...] = mv2
def test_is_contiguous():
u"""
>>> test_is_contiguous()
one sized is_c/f_contig True True
is_c/f_contig False True
f_contig.copy().is_c/f_contig True False
f_contig.copy_fortran().is_c/f_contig False True
one sized strided contig True True
strided False
"""
cdef int[::1, :, :] fort_contig = array((1,1,1), sizeof(int), 'i', mode='fortran')
cdef int[:,:,:] strided = fort_contig
print 'one sized is_c/f_contig', fort_contig.is_c_contig(), fort_contig.is_f_contig()
fort_contig = array((2,2,2), sizeof(int), 'i', mode='fortran')
print 'is_c/f_contig', fort_contig.is_c_contig(), fort_contig.is_f_contig()
print 'f_contig.copy().is_c/f_contig', fort_contig.copy().is_c_contig(), \
fort_contig.copy().is_f_contig()
print 'f_contig.copy_fortran().is_c/f_contig', \
fort_contig.copy_fortran().is_c_contig(), \
fort_contig.copy_fortran().is_f_contig()
print 'one sized strided contig', strided.is_c_contig(), strided.is_f_contig()
print 'strided', strided[::2].is_c_contig()
def call():
u'''
>>> call()
1000 2000 3000
1000
2000 3000
3000
1 1 1000
'''
cdef int[::1] mv1, mv2, mv3
cdef array arr = array((3,), sizeof(int), 'i')
mv1 = arr
cdef int *data
data = <int*>arr.data
data[0] = 1000
data[1] = 2000
data[2] = 3000
print (<int*>mv1._data)[0] , (<int*>mv1._data)[1] , (<int*>mv1._data)[2]
mv2 = mv1.copy()
print (<int*>mv2._data)[0]
print (<int*>mv2._data)[1] , (<int*>mv2._data)[2]
mv3 = mv2
cdef int *mv3_data = <int*>mv3._data
print (<int*>mv1._data)[2]
mv3_data[0] = 1
print (<int*>mv3._data)[0] , (<int*>mv2._data)[0] , (<int*>mv1._data)[0]
assert len(mv1) == 3
assert len(mv2) == 3
assert len(mv3) == 3
def two_dee():
u'''
>>> two_dee()
1 2 3 4
-4 -4
1 2 3 -4
1 2 3 -4
'''
cdef long[:,::1] mv1, mv2, mv3
cdef array arr = array((2,2), sizeof(long), 'l')
assert len(arr) == 2
try:
_ = len(mv1)
except UnboundLocalError:
pass
else:
assert False, "UnboundLocalError not raised for uninitialised memory view"
cdef long *arr_data
arr_data = <long*>arr.data
mv1 = arr
arr_data[0] = 1
arr_data[1] = 2
arr_data[2] = 3
arr_data[3] = 4
print (<long*>mv1._data)[0] , (<long*>mv1._data)[1] , (<long*>mv1._data)[2] , (<long*>mv1._data)[3]
mv2 = mv1
arr_data = <long*>mv2._data
arr_data[3] = -4
print (<long*>mv2._data)[3] , (<long*>mv1._data)[3]
mv3 = mv2.copy()
print (<long*>mv2._data)[0] , (<long*>mv2._data)[1] , (<long*>mv2._data)[2] , (<long*>mv2._data)[3]
print (<long*>mv3._data)[0] , (<long*>mv3._data)[1] , (<long*>mv3._data)[2] , (<long*>mv3._data)[3]
def fort_two_dee():
u'''
>>> fort_two_dee()
1 2 3 4
-4 -4
1 2 3 -4
1 3 2 -4
1 2 3 -4
'''
cdef array arr = array((2,2), sizeof(long), 'l', mode='fortran')
cdef long[::1,:] mv1, mv2, mv4
cdef long[:, ::1] mv3
cdef long *arr_data
arr_data = <long*>arr.data
mv1 = arr
arr_data[0] = 1
arr_data[1] = 2
arr_data[2] = 3
arr_data[3] = 4
print (<long*>mv1._data)[0], (<long*>mv1._data)[1], (<long*>mv1._data)[2], (<long*>mv1._data)[3]
mv2 = mv1
arr_data = <long*>mv2._data
arr_data[3] = -4
print (<long*>mv2._data)[3], (<long*>mv1._data)[3]
mv3 = mv2.copy()
print (<long*>mv2._data)[0], (<long*>mv2._data)[1], (<long*>mv2._data)[2], (<long*>mv2._data)[3]
print (<long*>mv3._data)[0], (<long*>mv3._data)[1], (<long*>mv3._data)[2], (<long*>mv3._data)[3]
mv4 = mv3.copy_fortran()
print (<long*>mv4._data)[0], (<long*>mv4._data)[1], (<long*>mv4._data)[2], (<long*>mv4._data)[3]
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