[Numpy-discussion] Any numpy trick for my problem ?
Stéfan van der Walt
stefan at sun.ac.za
Wed Oct 15 07:05:33 EDT 2008
Hi Uwe
2008/10/15 Uwe Schmitt <rocksportrocker at googlemail.com>:
> I got a matrix of 2100 lines, and I want to calculate blockwise mean
> vectors.
> Each block consists of 10 consecutive rows.
>
> My code looks like this:
>
> rv = []
> for i in range(0, 2100, 10):
> rv.append( mean(matrix[i:i+10], axis=0))
>
> return array(rv)
>
> Is there a more elegant and may be faster method to perform this
> calculation ?
You can use array striding. See
http://mentat.za.net/numpy/numpy_advanced_slides/
from slide 29 onwards.
Regards
Stéfan
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