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Posted to issues@commons.apache.org by "Michael Sammeth (JIRA)" <ji...@apache.org> on 2010/03/18 22:08:27 UTC
[jira] Created: (MATH-354) compiler dependency in
RandomDataImpl.getPoisson(double mean)
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
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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[jira] Resolved: (MATH-354) compiler dependency in
RandomDataImpl.getPoisson(double mean)
Posted by "Phil Steitz (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phil Steitz resolved MATH-354.
------------------------------
Resolution: Fixed
Fix Version/s: 2.1
The method has been rewritten in version 2.1. The current version no longer includes the compiler-dependent code referenced in this issue.
> 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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[jira] Closed: (MATH-354) compiler dependency in
RandomDataImpl.getPoisson(double mean)
Posted by "Phil Steitz (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phil Steitz closed MATH-354.
----------------------------
> 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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