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From "Dennis Hendriks (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-927) GammaDistribution cloning broken
Date Fri, 04 Jan 2013 11:42:12 GMT

     [ https://issues.apache.org/jira/browse/MATH-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dennis Hendriks updated MATH-927:
---------------------------------

    Attachment: bits-stream-generator-serializable.patch

Proposed patch.
                
> 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
>         Attachments: bits-stream-generator-serializable.patch, DistributionCloneTests.java
>
>
> 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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