compiler dependency in RandomDataImpl.getPoisson(double mean)
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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
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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