How to assign NaN values for cdef floats and other cython types

[pytrade]

Is there something equivalent to np.nan in cython that I can assign to
cython variables?

[Robert Bradshaw]

On Wed, May 25, 2011 at 12:45 PM, pytrade <vinj...@gmail.com> wrote:
> Is there something equivalent to np.nan in cython that I can assign to
> cython variables?

You could always use np.nan itself, or float("nan"). If you need it a
lot, save it to a local or global.

- Robert

[pytrade]

I mean how do I assign NaN's to a cdef'ed variables. Are you
suggesting the following:

cdef float NAN
NAN = float("NaN")



On May 25, 4:08 pm, Robert Bradshaw <rober...@math.washington.edu>
wrote:

[Robert Bradshaw]

On Wed, May 25, 2011 at 1:23 PM, pytrade <vinj...@gmail.com> wrote:
> I mean how do I assign NaN's to a cdef'ed variables. Are you
> suggesting the following:
>
> cdef float NAN
> NAN = float("NaN")

Yes, though you can put it all on one line if you want. Note that in
C, float != double. As far as I know, there's no good cross-platform
way to get NaNs in C.

- Robert

[Davoud Taghawi-Nejad]

wouldn't

cdef double NAN

NAN = float("NaN")

as a C double is a python float?

[Chris Barker - NOAA Federal]

 As far as I know, there's no good cross-platform

way to get NaNs in C.

Couldn't you specify the bit pattern? Unless you care about non-ieee754 platforms.

Or do an operation that results in a NaN -- I'd have to experiment to find one ....

CHB

- Robert

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