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Posted to issues@commons.apache.org by "Eric Prescott-Gagnon (JIRA)" <ji...@apache.org> on 2016/05/05 19:35:12 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=15272924#comment-15272924 ]
Eric Prescott-Gagnon commented on MATH-1318:
--------------------------------------------
I checked out the 'develop' branch and issued a new pull request: https://github.com/apache/commons-math/pull/32
> 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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