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https://issues.apache.org/jira/browse/MATH-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved MATH-1318.
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Resolution: Fixed
Fix Version/s: 4.0
Code merged into "develop" branch.
> 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
> Fix For: 4.0
>
>
> 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.
> new pull request: https://github.com/apache/commons-math/pull/32
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