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## Re: [Bug-gsl] hyperg_U(a,b,x) Questions about x<0 and values of a

**From**: |
Brian Gough |

**Subject**: |
Re: [Bug-gsl] hyperg_U(a,b,x) Questions about x<0 and values of a |

**Date**: |
Thu, 08 Jul 2010 10:35:30 +0100 |

**User-agent**: |
Wanderlust/2.15.6 (Almost Unreal) Emacs/23.2 Mule/6.0 (HANACHIRUSATO) |

At Wed, 07 Jul 2010 10:14:34 -0500,
Raymond Rogers wrote:
>* *
>* 1) I was unable to find the valid domain of the argument a when x<0. *
>* Experimenting yields what seem to be erratic results. Apparently*
>* correct answers occur when {x<0&a<0& a integer}. References would be*
>* sufficient. Unfortunately {x<0,a<0} is exactly the wrong range for my*
>* problem; but the recursion relations can be used to stretch to a>0. If*
>* I can find a range of correct operation for the domain of "a" of width >1.*
Thanks for the email. There are some comments about the domain for
the hyperg_U_negx function in specfunc/hyperg_U.c -- do they help?
--
Brian Gough