[SciPy-user] Very slow comparison of arrays of integers
Brian Granger
bgranger at scu.edu
Mon Jul 18 00:10:52 CDT 2005
Hello all,
I have some code that is using scipy/numeric and one bottleneck in
the code consists of comparing arrays or lists of integers. To my
dismay, I am finding that using Python lists is 15-20 times _faster_
than using numeric array's for this. The problem is that it seems
that there is no efficient way to compare arrays of integers.
Here is code that clearly demonstrates this problem:
from scipy import *
def test_list(n):
a = range(100)
for i in range(n):
r = (a == a)
def test_array(n):
a = array(range(100),Int)
for i in range(n):
r = allclose(a,a)
The test_list code runs about 20 times as fast as the test_array code
that uses allclose().
Is there any way of comparing to arrays of integers that would be as
fast or faster than using lists? Any hints would be greatly
appreciated.
Thanks
Brian
More information about the SciPy-user
mailing list