[Numpy-discussion] What is the sign of nan?

[Charles R Harris]

On Mon, Sep 29, 2008 at 3:52 PM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

> Hi All,
>
> I've been cleaning up the ufunc loops and the sign function currently
> doesn't have a defined behavior for nans. This makes the results depend on
> the order/type of comparisons in the code, which looks fragile to me. So
> what should it return? I vote for nan but am open for suggestions.
>

And while we're at it, lets decide how to treat max/min when nans are
involved. Or should we just say the behavior is undefined.

Chuck
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