[ https://issues.apache.org/jira/browse/MATH-295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason McFall reopened MATH-295:
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> RandomDataImpl.nextPoisson fails for means in range 6.0 - 19.99
> ---------------------------------------------------------------
>
>                 Key: MATH-295
>                 URL: https://issues.apache.org/jira/browse/MATH-295
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 1.2, 2.0
>         Environment: Java 1.6 on Mac 0S X
>            Reporter: Jason McFall
>
> RandomDataImpl.nextPoission(double mean) fails frequently (but not every time) from calls with mean >= 6.0 and < 20.0
> Below 6.0 and above 20 it seems fine, as far as I can tell by testing values at random.
> When it fails, the exception is as follows  - this from calling nextPoisson(6.0)
> org.apache.commons.math.MathRuntimeException$4: must have n >= 0 for n!, got n = -2
> at org.apache.commons.math.MathRuntimeException.createIllegalArgumentException(MathRuntimeException.java:282)
> at org.apache.commons.math.util.MathUtils.factorialLog(MathUtils.java:561)
> at org.apache.commons.math.random.RandomDataImpl.nextPoisson(RandomDataImpl.java:434)
> ie it's calling MathUtils.factorialLog with a negative argument.

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