On Mon, 31 Aug 2015 10:23:10 -0700
Stephan Hoyer <sho...@gmail.com> wrote:
>
> My inclination is that return NaN would be the appropriate choice. It's
> certainly consistent with the behavior for float dtypes -- my expectation
> for object dtype behavior is that it works exactly like applying the
> np.sign ufunc to each element of the array individually.
>
> On the other hand, I suppose there are other ways in which an object can
> fail all those comparisons (e.g., NaT?), so I suppose we could return None.
Currently:
>>> np.sign(np.timedelta64('nat'))
numpy.timedelta64(-1)
... probably because NaT is -2**63 under the hood. But in this case
returning NaT would sound better.
Regards
Antoine.
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