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Sébastien Brisard commented on MATH738:

Hi Thomas,
thanks for proposing your help. Please wait a little, as I have already implemented some more
methods, not yet committed.
For the time being, I'm working on a Java app to automatically assess the accuracy of implementation
of special functions. I need to write a small README to explain how it works, then I'll commit
the whole lot. I also have reimplemented logBeta. I will provide all these soon, but I am
drowned in work for the time being.
Thanks for your patience!
> Incomplete beta function I(x, a, b) is inaccurate for large values of a and/or b
> 
>
> Key: MATH738
> URL: https://issues.apache.org/jira/browse/MATH738
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Sébastien Brisard
> Assignee: Sébastien Brisard
> Labels: specialfunctions
> Fix For: 3.1, 4.0
>
>
> This was first reported in MATH718. The result of the current implementation of the
incomplete beta function I(x, a, b) is inaccurate when a and/or b are largeish.
> I've skimmed through [slatechttp://www.netlib.org/slatec/fnlib/betai.f], GSL, [Boosthttp://www.boost.org/doc/libs/1_38_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/sf_beta/ibeta_function.html]
as well as NR. At first sight, neither uses the same method to compute this function. I think
[TOMS708http://www.netlib.org/toms/708] is probably the best option.

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