[Numpy-discussion] Numpy and OpenMP

Christopher Barker Chris.Barker@noaa....
Mon Mar 17 12:06:11 CDT 2008


>  > Plus a certain amount of numpy code depends on order of
>  > evaluation:
>  >
>  > a[:-1] = 2*a[1:]

I'm confused here. My understanding of how it now works is that the 
above translates to:

1) create a new array (call it temp1) from a[1:], which shares a's data 
block.
2) create a temp2 array by multiplying 2 times each of the elements in 
temp1, and writing them into a new array, with a new data block
3) copy that temporary array into a[:-1]

Why couldn't step (2) be parallelized? Why isn't it already with, BLAS? 
Doesn't BLAS must have such simple routines?

Also, maybe numexpr could benefit from this?

-Chris




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