[
https://issues.apache.org/jira/browse/MATH-295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Phil Steitz closed MATH-295.
----------------------------
> 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.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
https://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
