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https://issues.apache.org/jira/browse/MATH-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273891#comment-15273891
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Gilles commented on MATH-1318:
------------------------------
Code available in branch "feature-MATH-1318".
I'll merge it into "develop" in a few days if there are no objections.
Side note: In future contributions, please make the JIRA issue identifier part
of the log message. Thanks!
Side question: How do I use the above URL?
The command
{noformat}
$ git pull https://github.com/apache/commons-math/pull/32
{noformat}
results in an error:
{noformat}
fatal: repository 'https://github.com/apache/commons-math/pull/32/' not found
{noformat}
What worked for me is to issue this command:
{noformat}
$ git pull https://github.com/EricPrescottGagnon/commons-math.git develop
{noformat}
I'd guess that the correct command could be generated through one click on
Github...
> 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.
> new pull request: https://github.com/apache/commons-math/pull/32
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