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# mode: run
from __future__ import unicode_literals
from cython.view cimport array
from cython cimport view as v
cimport cython as cy
include "cythonarrayutil.pxi"
def contiguity():
'''
>>> contiguity()
12 4
2 3
2
<BLANKLINE>
4 8
2 3
2
'''
cdef v.array cvarray = v.array(shape=(2,3), itemsize=sizeof(int), format="i", mode='c')
assert cvarray.len == 2*3*sizeof(int), (cvarray.len, 2*3*sizeof(int))
assert cvarray.itemsize == sizeof(int)
print cvarray.strides[0], cvarray.strides[1]
print cvarray.shape[0], cvarray.shape[1]
print cvarray.ndim
print
cdef v.array farray = v.array(shape=(2,3), itemsize=sizeof(int), format="i", mode='fortran')
assert farray.len == 2*3*sizeof(int)
assert farray.itemsize == sizeof(int)
print farray.strides[0], farray.strides[1]
print farray.shape[0], farray.shape[1]
print farray.ndim
def acquire():
'''
>>> acquire()
'''
cdef object[int, ndim=1, mode="c"] buf1d = \
array(shape=(10,), itemsize=sizeof(int), format='i', mode='c')
cdef object[int, ndim=2, mode="c"] buf2d = \
array(shape=(10,10), itemsize=sizeof(int), format='i')
cdef object[unsigned long, ndim=3, mode='fortran'] buf3d = \
array(shape=(1,2,3), itemsize=sizeof(unsigned long), format='L', mode='fortran')
cdef object[long double, ndim=3, mode='fortran'] bufld = \
array(shape=(1,2,3), itemsize=sizeof(long double), format='g', mode='fortran')
def full_or_strided():
'''
>>> full_or_strided()
'''
cdef object[float, ndim=2, mode='full'] fullbuf = \
array(shape=(10,10), itemsize=sizeof(float), format='f', mode='c')
cdef object[long long int, ndim=3, mode='strided'] stridedbuf = \
array(shape=(1,2,3), itemsize=sizeof(long long int), format='q', mode='fortran')
def dont_allocate_buffer():
"""
>>> dont_allocate_buffer()
callback called
"""
cdef array result = array((10, 10), itemsize=sizeof(int), format='i', allocate_buffer=False)
assert result.data == NULL
result.callback_free_data = callback
result = None
def test_cython_array_getbuffer():
"""
>>> test_cython_array_getbuffer()
98
61
98
61
"""
cdef int[:, ::1] cslice = create_array((14, 10), 'c')
cdef int[::1, :] fslice = create_array((14, 10), 'fortran')
print cslice[9, 8]
print cslice[6, 1]
print fslice[9, 8]
print fslice[6, 1]
def test_cython_array_index():
"""
>>> test_cython_array_index()
98
61
98
61
"""
c_array = create_array((14, 10), 'c')
f_array = create_array((14, 10), 'fortran')
print c_array[9, 8]
print c_array[6, 1]
print f_array[9, 8]
print f_array[6, 1]
cdef int *getp(int dim1=10, int dim2=10, dim3=1) except NULL:
print "getp()"
cdef int *p = <int *> malloc(dim1 * dim2 * dim3 * sizeof(int))
if p == NULL:
raise MemoryError
for i in range(dim1 * dim2 * dim3):
p[i] = i
return p
cdef void callback_free_data(void *p):
print 'callback free data called'
free(p)
def test_array_from_pointer():
"""
>>> test_array_from_pointer()
getp()
69
c
getp()
callback free data called
fortran
getp()
56
getp()
56
getp()
119
callback free data called
"""
cdef int *p = getp()
cdef array c_arr = <int[:10, :10]> p
c_arr.callback_free_data = callback_free_data
print c_arr[6, 9]
print c_arr.mode
c_arr = (<int[:10:1, :10]> getp())
print c_arr.mode
c_arr.callback_free_data = free
c_arr = <int[:10, :10]> getp()
c_arr.callback_free_data = free
cdef int[:, ::1] mslice = c_arr
print mslice[5, 6]
c_arr = <int[:12, :10]> getp(12, 10)
c_arr.callback_free_data = free
print c_arr[5, 6]
cdef int m = 12
cdef int n = 10
c_arr = <int[:m, :n]> getp(m, n)
c_arr.callback_free_data = callback_free_data
print c_arr[m - 1, n - 1]
def test_array_from_pointer_3d():
"""
>>> test_array_from_pointer_3d()
getp()
3 3
True True
"""
cdef int *p = getp(2, 2, 2)
cdef array c_arr = <int[:2, :2, :2:1]> p
cdef array f_arr = <int[:2:1, :2, :2]> p
cdef int[:, :, ::1] m1 = c_arr
cdef int[::1, :, :] m2 = f_arr
print m1[0, 1, 1], m2[1, 1, 0]
print m1.is_c_contig(), m2.is_f_contig()
def test_cyarray_from_carray():
"""
>>> test_cyarray_from_carray()
0 8 21
0 8 21
"""
cdef int[7][8] a
for i in range(7):
for j in range(8):
a[i][j] = i * 8 + j
cdef int[:, :] mslice = <int[:, :]> a
print mslice[0, 0], mslice[1, 0], mslice[2, 5]
mslice = a
print mslice[0, 0], mslice[1, 0], mslice[2, 5]
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