[Numpy-discussion] nonzero() behaviour has changed

[Travis Oliphant]

Simon Burton wrote:
> On Tue, 16 May 2006 15:15:23 -0400
> Alan G Isaac <aisaac at american.edu> wrote:
>
>   
>> 2. How are people using this?  I trust that the numarray
>>    behavior was well considered, but I would have expected
>>    coordinates to be grouped rather than spread across
>>    the arrays in the tuple.
>>     
>
>   
The split-tuple is for fancy-indexing.  That's how you index a 
multidimensional array using an array of integers.  The output of 
a.nonzero() is setup to do that so that

a[a.nonzero()]

works.

> Yes, this strikes me as bizarre.
> How about we make a new function, eg. argwhere, that
> returns an array of indices ?
>   
> argwhere( array( [[0,1],[0,1]] ) ) -> [[0,1],[1,1]]
>
>   
I could see the value of this kind of function too.

-Travis