[Numpy-discussion] sign, signbit and nans once again.

[Charles R Harris]

I want to get this settled for the 1.3 release. My thoughts are:


   - signbit returns the signbit whether or not the number is a nan.
   - sign returns nan for nans.

Copysign is currently unimplemented. I'm thinking of adding it, but making
it return nans when copying the sign of a nan. This isn't how it is in BSD,
but the behavior in this case is unspecified by the standard.

Chuck
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