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https://issues.apache.org/jira/browse/MATH-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart resolved MATH-1283.
-----------------------------------
Resolution: Fixed
Fix Version/s: 3.6
4.0
Fixed in the following commits:
* 3.6: 40f35da56
* 4.0: 9e0c5ad4b
Thanks for the report and suggested fix!
> Gamma function computation
> --------------------------
>
> Key: MATH-1283
> URL: https://issues.apache.org/jira/browse/MATH-1283
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 4.0, 3.5
> Environment: All
> Reporter: Jean Noel Delavalade
> Priority: Minor
> Fix For: 4.0, 3.6
>
>
> In the gamma method, when handling the case "absX > 20", the computation of
> gammaAbs should replace "x" (see code below with x in bold) by "absX".
> For large negative values of x, the function returns with the wrong sign.
> final double gammaAbs = SQRT_TWO_PI / *x* *
> FastMath.pow(y, absX + 0.5) *
> FastMath.exp(-y) * lanczos(absX);
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