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https://issues.apache.org/jira/browse/MATH-354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Steitz closed MATH-354.
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> compiler dependency in RandomDataImpl.getPoisson(double mean)
> -------------------------------------------------------------
>
> Key: MATH-354
> URL: https://issues.apache.org/jira/browse/MATH-354
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.0
> Environment: jre1.5/jre1.6
> Reporter: Michael Sammeth
> Fix For: 2.1
>
>
> Hi,
> in RandomDataImpl.getPoisson(double mean) I got the following problem in the
> case mean>= 6.0:
> in the branch if (u <= c1):
> if (x < -mu)
> w = Double.POSITIVE_INFINITY;
> implicits that (int) (mu+ x) < 0
> I found that for some compiler/run-time environments the subsequent update of
> the "accept" value then fails, as by the right hand side of the comparison
> leads to an Exception in MathUtils.factorialLog((int) (mu + x)). Some
> compiler/jre combinations, however, skip evaluating the right side as by
> isInfinity(w).
> To ensure stability, I currently worked around by an explicit
> if(Double.isInfinity(w)) branch, however, I would like to ask whether there
> is a more elegant way to ensure general functionality of that method.
> Thank you, micha.
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