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From "Phil Steitz (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-701) Seeding a default RNG
Date Sat, 05 Nov 2011 06:50:51 GMT

     [ https://issues.apache.org/jira/browse/MATH-701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz resolved MATH-701.
------------------------------

    Resolution: Fixed

Changes to WELL, MersenneTwister committed in r1197896.
                
> Seeding a default RNG
> ---------------------
>
>                 Key: MATH-701
>                 URL: https://issues.apache.org/jira/browse/MATH-701
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Assignee: Gilles
>             Fix For: 3.0
>
>
> In "RandomDataImpl":
> {code}
> private RandomGenerator getRan() {
>     if (rand == null) {
>         rand = new JDKRandomGenerator();
>         rand.setSeed(System.currentTimeMillis());
>     }
>     return rand;
> }
> {code}
> The conditional branch is used by "sample()" in "AbstractContinuousDistribution".
> When several "...Distribution" objects are instantiated in a short time interval, they
are seeded with the same value.

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