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From Sébastien Brisard <sebastien.bris...@m4x.org>
Subject Re: [math] About MATH-718
Date Fri, 03 Feb 2012 08:35:11 GMT
Hi Luc,
>
> Hi Sébastien,
>
>> as rightly pointed out by Christian, the bug reported in MATH-718 is
>> in fact a result of the current implementation of the incomplete beta
>> function I(x, a, b), which is inaccurate when a and/or b are
>> large-ish. I think this is a very interesting issue, but also one
>> which will not be solved in one or two days' work. I've skimmed
>> through slatec [1], GSL, Boost [2] as well as you-know-who. Neither
>> uses the same method to compute this function. I would like to review
>> in detail those methods before coming up with a fix for this issue. So
>> I propose that we mark MATH-718 as won't fix, and open a new JIRA
>> issue to affect 3.1 or 4.0. Working on special functions (which is a
>> weak side of CM anyway) is something I would be very much interested
>> in.
>
> Rather than won't fix, I would prefer simply postponing the issue to 3.1.
>
> Luc
>
Yes, that's probably better. Should I open a new ticket specifically
dedicated to the incomplete Beta function, or should we keep
everything in the same place?
Sébastien


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