[Numpy-discussion] unique1d returning indices

[Stéfan van der Walt]

2008/8/11 Robert Cimrman <cimrman3 at ntc.zcu.cz>:
>>> Note also that the order of outputs has changed (previously unique1d()
>>> returned (i, b) for return_index=True).
>>
>> Does this not constitute an API change?
>
> It does. Are there many users of unique1d( a, return_index=True ) out there?
>
> The new way is consistent with matlab, and IMHO more logical - the
> additional return values are appended to the returned tuple rather than
> prepended. It was my mistake to introduce the previous order (do not
> recall the motivation anymore :]).

The new way is definitely more consistent -- I think one could almost
call its current behaviour a bug.  Unless there are objections, let's
follow the standard route: put a deprecation warning in place for one
release and remove it in the next.

Stéfan