[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## [Help-gsl] ln of gamma function for negative arguments

**From**: |
Marc Normandin |

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

**Date**: |
Wed, 09 Aug 2006 22:00:49 -0400 |

Hello,
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.
At the current time the only way that I've found to compute the ln of gamma for
negative non-integer values is to treat the argument as a complex number z = -x
+ 0i and then use Ln(z) = ln(|z|) + iPI, for the term involving the sin from
the relfection formula.
I'd appreciate help and suggestions.
Thanks,
Marc.

**[Help-gsl] ln of gamma function for negative arguments**,
*Marc Normandin* **<=**