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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1318) Implement reflection formula to digamma function to improve performance on negative values.
Date Fri, 06 May 2016 10:30:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273891#comment-15273891
] 

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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