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## Re: [Help-gsl] ln of gamma function for negative arguments

**From**: |
Brian Gough |

**Subject**: |
Re: [Help-gsl] ln of gamma function for negative arguments |

**Date**: |
Thu, 10 Aug 2006 13:00:04 +0100 |

**User-agent**: |
Wanderlust/2.14.0 (Africa) Emacs/21.3 Mule/5.0 (SAKAKI) |

At Wed, 09 Aug 2006 22:00:49 -0400,
Marc Normandin wrote:
>* I require the computation of ln of the gamma function for all*
>* negative non-integer values. The reflection formula can be used for*
>* half of the negative non-integers along with the log since for half*
>* the values will be positive. However, I would like to obtain a value*
>* for the other half. I'm using the ln of gamma as an intermediate*
>* step after which I raise the result with an exponential, so that*
>* ultimately I am not after the actual value of ln gamma itself. I am*
>* open to any methods that work.*
GSL has the functions gsl_sf_gamma, gsl_sf_lngamma and
gsl_sf_lngamma_sgn_e which work for both positive and negative x -- I
think those should cover all possibilities. See the GSL reference
manual for details of the functions.
--
best regards,
Brian Gough
Network Theory Ltd,
Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/