[
https://issues.apache.org/jira/browse/MATH-249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682490#action_12682490
]
Luc Maisonobe commented on MATH-249:
------------------------------------
Could you check if this simple implementation provides good enough results :
{code}
public static double incompleteGamma(double a, double x) {
return regularizedGammaQ(a, x) * Math.exp(logGamma(a));
}
{code}
this is basically the inversion of equation (2) in
[http://mathworld.wolfram.com/RegularizedGammaFunction.html]
If so, I'll check it in.
> Gamma incomplete
> ----------------
>
> Key: MATH-249
> URL: https://issues.apache.org/jira/browse/MATH-249
> Project: Commons Math
> Issue Type: New Feature
> Affects Versions: 2.0
> Reporter: Gilles
> Priority: Minor
>
> Hello.
> In the class "special.Gamma", there seem to be no explicit way to obtain the
> incomplete gamma function.[1]
> Could you provide it?
> Thanks,
> Gilles
> [1] http://mathworld.wolfram.com/IncompleteGammaFunction.html
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
