[Numpy-discussion] Numpy Overhead

Nathaniel Smith njs at pobox.com
Tue Feb 28 23:15:20 EST 2017

On Feb 28, 2017 2:57 PM, "Sebastian K" <sebastiankaster at googlemail.com>

Yes it is true the execution time is much faster with the numpy function.

 The Code for numpy version:

def createMatrix(n):
Matrix = np.empty(shape=(n,n), dtype='float64')
for x in range(n):
for y in range(n):
Matrix[x, y] = 0.1 + ((x*y)%1000)/1000.0
return Matrix

if __name__ == '__main__':
n = getDimension()
if n > 0:
A = createMatrix(n)
B = createMatrix(n)
C = np.empty(shape=(n,n), dtype='float64')
C = np.dot(A,B)


In the pure python version I am just implementing the multiplication with
three for-loops.

Measured data with libmemusage:
dimension of matrix: 100x100
heap peak pure python3: 1060565
heap peakt numpy function: 4917180

4 megabytes is less than the memory needed just to load numpy :-). Try a
1000x1000 array (or even bigger), and I think you'll see more reasonable

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