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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1318) Implement reflection formula to digamma function to improve performance on negative values.
Date Sat, 23 Apr 2016 01:08:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15254993#comment-15254993
] 

Gilles commented on MATH-1318:
------------------------------

Hi Eric.

Sorry that your request seems to have been ignored.   Hopefully you are still around.
Could you please check out the "develop" branch and issue a new pull request?  Thanks in advance.


> Implement reflection formula to digamma function to improve performance on negative values.
> -------------------------------------------------------------------------------------------
>
>                 Key: MATH-1318
>                 URL: https://issues.apache.org/jira/browse/MATH-1318
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Eric Prescott-Gagnon
>            Priority: Minor
>
> The performance of the digamma( x ) function is in O(|x|) for negative values. Implementing
the reflection formula (https://en.wikipedia.org/wiki/Digamma_function#Reflection_formula)
can improve the performance in that case.
> github pull request: https://github.com/apache/commons-math/pull/23



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