[Numpy-discussion] What is the sign of nan?
Charles R Harris
charlesr.harris@gmail....
Mon Sep 29 23:14:33 CDT 2008
On Mon, Sep 29, 2008 at 9:54 PM, David Cournapeau <
david@ar.media.kyoto-u.ac.jp> wrote:
> Charles R Harris wrote:
> >
> >
> > On Mon, Sep 29, 2008 at 9:02 PM, David Cournapeau
> > <david@ar.media.kyoto-u.ac.jp <mailto:david@ar.media.kyoto-u.ac.jp>>
> > wrote:
> >
> > Charles R Harris wrote:
> > >
> > > So the proposition is, sign, max, min return nan when any of the
> > > arguments is nan.
> >
> > Note that internally, signbit (the C function) returns an integer.
> >
> >
> > That is the signature of the ufunc. It could be changed...
>
> Nope, I am talking about the C99 signbit macro. man signbit tells me:
>
> NAME
> signbit - test sign of a real floating point number
>
> SYNOPSIS
> #include <math.h>
>
> int signbit(x);
>
> Compile with -std=c99; link with -lm.
>
Yes, that too. But I was thinking of the ufunc returning nan when needed.
However, I think -1 is the way to go for that to get minimal breakage.
Chuck
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://projects.scipy.org/pipermail/numpy-discussion/attachments/20080929/58587cff/attachment.html
More information about the Numpy-discussion
mailing list