[Numpy-discussion] BigInteger equivalent in numpy

David Cournapeau david@ar.media.kyoto-u.ac...
Sun Jun 7 05:05:36 CDT 2009


(Please do not send twice your message to numpy/scipy ML, thank you)

wierob wrote:
> Hi,
>
> int64 and float seem to work for the stderr calculation. Now, the 
> calculation of the p-value causes an underflow.
>
> File "C:\Python26\lib\site-packages\scipy\stats\distributions.py", line 2829,in _cdf
>     return special.stdtr(df, x)
> FloatingPointError: underflow encountered in stdtr
>
> It seems that the error occurs in scipy.special.stdtr(df, x) if df = 
> array([13412]) and x = array([61.88071696]).
>   

The error seems to happen in the cephes library (the library we use for
many functions in scipy.special, including this one). I don't know
exactly what triggers it (your df is quite high, though, and the cdf is
already quite past the 1-eps at your point).

cheers,

David


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