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