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From "Sebb (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-701) Seeding a default RNG
Date Fri, 04 Nov 2011 09:41:00 GMT

    [ https://issues.apache.org/jira/browse/MATH-701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143870#comment-13143870
] 

Sebb commented on MATH-701:
---------------------------

If lazy init is dropped, then the rand field can be made final.

Can secRand be made final? This would mean dropping setSecureAlgorithm() in favour of an extra
ctor.
Since secRand is not always needed, this is an argument for making the secure stuff a sub-class.
Alternatively, IODH could perhaps be used with secRand.
                
> 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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