[jira] [Resolved] (MATH-1241) Digamma calculation produces SOE on NaN argument

["Thomas Neidhart (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-1241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Neidhart resolved MATH-1241.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 3.6
                   4.0

Fixed in the following commits:

 * 4.0: 471e6b078a7891aea99b77f200e828
 * 3.6: 229232829c6d8741138decf27c4909

Now the Gamma.digamma and trigamma methods will propagate the input argument if it is not a real value.

Thanks for the report!

> Digamma calculation produces SOE on NaN argument
> ------------------------------------------------
>
>                 Key: MATH-1241
>                 URL: https://issues.apache.org/jira/browse/MATH-1241
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.5
>            Reporter: Aleksei Dievskii
>            Priority: Minor
>             Fix For: 4.0, 3.6
>
>
> Digamma doesn't work particularly well with NaNs.
> How to reproduce: call Gamma.digamma(Double.NaN)
> Expected outcome: returns NaN or throws a meaningful exception
> Real outcome: crashes with StackOverflowException, as digamma enters infinite recursion.



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