[Numpy-discussion] Adding 'where' to ufunc methods?

josef.pktd at gmail.com josef.pktd at gmail.com
Wed Apr 1 15:55:45 EDT 2015

On Wed, Apr 1, 2015 at 3:47 PM, Nathaniel Smith <njs at pobox.com> wrote:
> On Wed, Apr 1, 2015 at 11:34 AM, Jaime Fernández del Río
> <jaime.frio at gmail.com> wrote:
>> This question on StackOverflow:
>> http://stackoverflow.com/questions/29394377/minimum-of-numpy-array-ignoring-diagonal
>> Got me thinking that I had finally found a use for the 'where' kwarg of
>> ufuncs. Unfortunately it is only provided for the ufunc itself, but not for
>> any of its methods.
>> Is there any fundamental reason these were not implemented back in the day?
>> Any frontal opposition to having them now?
> The where= argument stuff was rescued from the last aborted attempt to
> add missing value support to numpy. The only reason they aren't
> implemented for the ufunc methods is that Mark didn't get that far.
> +1 to adding them now.

can you get `where` in ufuncs without missing value support?

what's the result for ufuncs that are not reduce operations?
what's the result for reduce operations along an axis if there is
nothing there (in a row or column or ...)?


> -n
> --
> Nathaniel J. Smith -- http://vorpus.org
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