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Posted to issues@commons.apache.org by "Eric Prescott-Gagnon (JIRA)" <ji...@apache.org> on 2016/05/05 19:37:13 UTC

[jira] [Updated] (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 ]

Eric Prescott-Gagnon updated MATH-1318:
---------------------------------------
    Description: 
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

  was:
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


> 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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