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From "Gilles (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-701) Seeding a default RNG
Date Thu, 03 Nov 2011 13:27:36 GMT
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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