[Numpy-discussion] what is nan_to_num() for float32 ?

Sebastian Haase haase at msg.ucsf.edu
Tue Sep 12 15:39:54 CDT 2006


On Tuesday 12 September 2006 13:33, Sebastian Haase wrote:
> Hi !
> I have a nice ndarray image viewer built on OpenGL - one annoyance though
> is that is crashes if the array contains any NaN, or inf, ...
>
> So, I found N.nan_to_num  - but OpenGL (read: video cards) supports only
> single precision float (N.float32)
>
> So I get this:
> >>> N.nan_to_num([N.inf])
>
> [  1.79769313e+308]
>
> >>> N.nan_to_num([N.inf]).astype(N.float32)
>
> [              inf]
>
> Could nan_to_num() get an optional dtype argument ?
>
> Thanks,
> Sebastian Haase

OK - sorry for the noise...  this is how to do it:

>>> N.nan_to_num(  N.array([N.nan,N.inf,-N.inf],N.float32)  )
[  0.00000000e+00   3.40282347e+38  -3.40282347e+38]


In the meantime I noticed that there is a 
N.asarray_chkfinite() function
but no equivalent for 
N.asanyarray() !

Should   N.asanyarray_chkfinite()  be added  !?

-Sebastian




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