test for nan

[Michael Hudson]

John Hunter <jdhunter at ace.bsd.uchicago.edu> writes:

> I have a C extension module that is returning some doubles.  When the
> doubles get out of range, the numbers print as 'nan'.
> 
> Is there a better way to test for NaN than
> 
>    str(p1)=='nan'
> 
> where p1 is a float?

I'd hope so: that's exceeding unportable.  Of course, all things to do
with nans are unportable, so you're going to have to tell us more of
your requirements...

Cheers,
mwh

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