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Posted to issues@commons.apache.org by "Dennis Hendriks (JIRA)" <ji...@apache.org> on 2013/01/04 12:38:12 UTC

[jira] [Created] (MATH-927) GammaDistribution cloning broken

Dennis Hendriks created MATH-927:
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             Summary: GammaDistribution cloning broken
                 Key: MATH-927
                 URL: https://issues.apache.org/jira/browse/MATH-927
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.1
            Reporter: Dennis Hendriks


Serializing a GammaDistribution and deserializing it, does not result in a cloned distribution that produces the same samples.

Cause: GammaDistribution inherits from AbstractRealDistribution, which implements Serializable. AbstractRealDistribution has random, in which we have a Well19937c instance, which inherits from AbstractWell. AbstractWell implements Serializable. AbstractWell inherits from BitsStreamGenerator, which is not Serializable, but does have a private field 'nextGaussian'.

Solution: Make BitStreamGenerator implement Serializable as well.

This probably affects other distributions as well.

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