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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2016/05/14 16:25:12 UTC
[jira] [Resolved] (MATH-1318) Implement reflection formula to
digamma function to improve performance on negative values.
[ https://issues.apache.org/jira/browse/MATH-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gilles resolved MATH-1318.
--------------------------
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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