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From Benedikt Ritter <b...@systemoutprintln.de>
Subject Re: [math] About MATH-718
Date Fri, 03 Feb 2012 08:40:28 GMT
Sorry, I miss-clicked... wanted to send that mail to your e-mail address 
directly since the mailing list rejects attachments...
For what ever reason "answer to sender" has the same effect as "anwser 
to list" in Thunderbird.
I'll send it again to your address :-)

Regards,
Benedikt

Am 03.02.2012 09:37, schrieb Benedikt Ritter:
> Am 03.02.2012 08:14, schrieb Sébastien Brisard:
>> Hi,
>> 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.
>>
>> 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.
>
> Hi Sébastien,
>
> fortunately my university has full access to the ACM digital library.
> I've attached the article to this e-mail.
>
> have a nice day!
> Benedikt
>
>>
>> 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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>
>
>
>
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