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Re: [Bug-gsl] bugs when using gsl_sf_hyperg_U

From: Feng Gao
Subject: Re: [Bug-gsl] bugs when using gsl_sf_hyperg_U
Date: Mon, 10 Mar 2014 21:01:43 -0400

Sorry for the typo but for example 1) listed in the previous email:

gsl_sf_hyperg_U(1, -500, 0.1) gives the correct value: ~1.99e-3.

The problem happens when calculating gsl_sf_hyperg_U(1, -500, 40): gsl:
gsl: hyperg.c:165: ERROR: overflow. The value should be ~0.00184 so I
suppose this is a bug.

Again, thanks very much if you can help me solve this problem since I very
much need it in my research.

Best Regards,


2014-03-10 19:53 GMT-04:00 Feng Gao <address@hidden>:

> Hi,
> I have been using the gsl_sf_hyperg_U function for a while and I found
> several bugs when calculating normal values. For example,
> 1) gsl_sf_hyperg_U(1, -500, 0.1) gives incorrect value: 9.3246e+03, which
> actually should be around 0.19.
> 2) Many domain error bugs. For example, gsl_sf_hyperg_U(1, -6.67, 1)
> should have value ~0.128 but will invoke domain error for gsl.
> Hope that you can further investigate this and come up with solutions.
> Thanks!
> Best Regards,
> Feng

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