[jira] [Commented] (NUMBERS-153) Gamma.digamma() and Gamma.trigamma() throw stack overflow exception

["Dmitriy V. Golovashkin (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUMBERS-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17223173#comment-17223173 ] 

Dmitriy V. Golovashkin commented on NUMBERS-153:
------------------------------------------------

A potential nonrecursive solution for digamma:

https://stackoverflow.com/questions/16258810/how-to-rewrite-the-digamma-function-to-nonrecursive

> Gamma.digamma() and Gamma.trigamma() throw stack overflow exception
> -------------------------------------------------------------------
>
>                 Key: NUMBERS-153
>                 URL: https://issues.apache.org/jira/browse/NUMBERS-153
>             Project: Commons Numbers
>          Issue Type: Bug
>          Components: gamma
>    Affects Versions: 1.0-beta1
>            Reporter: Dmitriy V. Golovashkin
>            Priority: Major
>             Fix For: 1.0
>
>
> {color:#0033b3}java.lang.StackOverflowError is thrown in{color}
> {code:java}
>   double x = -10_000;
>   double ans1 = Gamma.digamma(x);  // stack overflow
>   double ans2 = Gamma.trigamma(x); // stack overflow{code}
> It would be nice if the methods returned NaN / Infinity, rather than abort calculations (due to recursion gone wild).
> Please see the initial report in Commons Math3:
> https://issues.apache.org/jira/browse/MATH-1561



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