[jira] [Commented] (NUMBERS-167) RegularizedGamma.P with precomputed LogGamma value

["Gilles Sadowski (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUMBERS-167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706906#comment-17706906 ] 

Gilles Sadowski commented on NUMBERS-167:
-----------------------------------------

[~aherbert],

We dropped the ball on this API enhancement, and I've just been asked whether a "Commons" function can do the job of replacing a use case with a precomputed argument...

> RegularizedGamma.P with precomputed LogGamma value
> --------------------------------------------------
>
>                 Key: NUMBERS-167
>                 URL: https://issues.apache.org/jira/browse/NUMBERS-167
>             Project: Commons Numbers
>          Issue Type: Wish
>          Components: gamma
>            Reporter: Gilles Sadowski
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: pr_106.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> We have
> {code:java}
> double v = RegularizedGamma.P.value(a, x);
> {code}
> where method {{value}} internally calls {{LogGamma.value(a)}}.
> There is a use-case for
> {code:java}
> double logGammaA = LogGamma.value(a);
> double v = RegularizedGamma.P.value(a, x, logGammaA);
> {code}
> for when the user varies {{x}} but not {{a}}.
> Method name TBD:  Another overload of {{value}} may be confusing (?).



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