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From Luc Maisonobe <Luc.Maison...@free.fr>
Subject Re: [math] About MATH-718
Date Fri, 03 Feb 2012 08:04:08 GMT
Le 03/02/2012 08:14, Sébastien Brisard a écrit :
> Hi,

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

> 
> Do you agree with this proposal?
> Sébastien
> 
> PS: my lab does not subscribe to ACM. Does anyone have access to this paper
> TRANSACTIONS ON MATHEMATICAL SOFTWARE,
> VOL. 18, NO. 3, SEPTEMBER, 1992, PP. 360-373z.
> 
> The FORTRAN code is freely available [3].
> 
> [1] http://www.netlib.org/slatec/fnlib/betai.f
> [2] http://www.boost.org/doc/libs/1_38_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/sf_beta/ibeta_function.html
> [3] http://www.netlib.org/toms/708
> 
> 
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