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

Charles R Harris charlesr.harris@gmail....
Mon Sep 29 16:52:30 CDT 2008

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.

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