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from __future__ import division, absolute_import, print_function
from scipy import weave
from numpy import rand, zeros_like
def example1(a):
if not isinstance(a, list):
raise ValueError("argument must be a list")
code = r"""
int i;
py::tuple results(2);
for (i=0; i<a.length(); i++) {
a[i] = i;
}
results[0] = 3.0;
results[1] = 4.0;
return_val = results;
"""
return weave.inline(code,['a'])
def arr(a):
if a.ndim != 2:
raise ValueError("a must be 2-d")
code = r"""
int i,j;
for(i=1;i<Na[0]-1;i++) {
for(j=1;j<Na[1]-1;j++) {
B2(i,j) = A2(i,j) + A2(i-1,j)*0.5 +
A2(i+1,j)*0.5 + A2(i,j-1)*0.5
+ A2(i,j+1)*0.5
+ A2(i-1,j-1)*0.25
+ A2(i-1,j+1)*0.25
+ A2(i+1,j-1)*0.25
+ A2(i+1,j+1)*0.25;
}
}
"""
b = zeros_like(a)
weave.inline(code,['a','b'])
return b
a = [None]*10
print(example1(a))
print(a)
a = rand(512,512)
b = arr(a)
h = [[0.25,0.5,0.25],[0.5,1,0.5],[0.25,0.5,0.25]]
import scipy.signal as ss
b2 = ss.convolve(h,a,'same')
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