On Tue, Sep 29, 2015 at 12:16 PM, Nathaniel Smith <n...@pobox.com> wrote:
> On Sep 29, 2015 8:25 AM, "Anne Archibald" <archib...@astron.nl> wrote: > > > > IEEE 754 has signum(NaN)->NaN. So does np.sign on floating-point arrays. > Why should it be different for object arrays? > > The argument for doing it this way would be that arbitrary python objects > don't have a sign, and the natural way to implement something like > np.sign's semantics using only the "object" interface is > > if obj < 0: > return -1 > elif obj > 0: > return 1 > elif obj == 0: > return 0 > else: > raise > That is what current master does, using PyObject_RichCompareBool for the comparisons. Chuck
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