[Numpy-discussion] unique return_index order?

[Charles R Harris]

On Fri, Mar 21, 2014 at 6:26 PM, Alan G Isaac <alan.isaac at gmail.com> wrote:

> The documentation of numpy.unique
> http://docs.scipy.org/doc/numpy/reference/generated/numpy.unique.html
> does not seem to promise that return_index=True will always index the
> *first* occurrence of each unique item, which I believe is the current
> behavior.
>
> A promise would be nice.
> Is it intended?
>
>
Yes, it is intended, although the required mergesort wasn't available for
all types before numpy 1.7.

Chuck
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