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From "Michael Sammeth (JIRA)" <>
Subject [jira] Created: (MATH-354) compiler dependency in RandomDataImpl.getPoisson(double mean)
Date Thu, 18 Mar 2010 21:08:27 GMT
compiler dependency in RandomDataImpl.getPoisson(double mean)

                 Key: MATH-354
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 2.0
         Environment: jre1.5/jre1.6
            Reporter: Michael Sammeth


in RandomDataImpl.getPoisson(double mean) I got the following problem in the case mean>=

in the branch if (u <= c1):

if (x < -mu)

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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