[Numpy-discussion] howto apply-along-axis?

Nathaniel Smith njs@pobox....
Fri Mar 22 09:21:03 CDT 2013


On 22 Mar 2013 14:09, "Neal Becker" <ndbecker2@gmail.com> wrote:
>
> I frequently find I have my 1d function that performs some reduction that
I'd
> like to apply-along some axis of an n-d array.
>
> As a trivial example,
>
> def sum(u):
>   return np.sum (u)
>
> In this case the function is probably C/C++ code, but that is irrelevant
(I
> think).
>
> Is there a reasonably efficient way to do this within numpy?

The core infrastructure for this sort of thing is there - search on
"generalized ufuncs". There's no python-level api as far as I know, though,
yet.

You could write a reasonable facsimile of np.vectorize for such functions
using nditer.

-n
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