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From "Phil Steitz (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-723) BitStreamGenerators (MersenneTwister, Well generators) do not clear normal deviate cache on setSeed
Date Sun, 11 Dec 2011 22:00:40 GMT

     [ https://issues.apache.org/jira/browse/MATH-723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz resolved MATH-723.
------------------------------

    Resolution: Fixed

Fixed in r1213087.
                
> BitStreamGenerators (MersenneTwister, Well generators) do not clear normal deviate cache
on setSeed
> ---------------------------------------------------------------------------------------------------
>
>                 Key: MATH-723
>                 URL: https://issues.apache.org/jira/browse/MATH-723
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0, 2.1, 2.2
>            Reporter: Phil Steitz
>            Assignee: Phil Steitz
>             Fix For: 3.0
>
>
> The BitStream generators generate normal deviates (for nextGaussian) in pairs, caching
the last value generated. When reseeded, the cache should be cleared; otherwise seeding two
generators with the same value is not guaranteed to generate the same sequence.

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