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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