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Posted to issues@commons.apache.org by "Phil Steitz (Created) (JIRA)" <ji...@apache.org> on 2011/12/11 22:04:40 UTC
[jira] [Created] (MATH-723) BitStreamGenerators (MersenneTwister,
Well generators) do not clear normal deviate cache on setSeed
BitStreamGenerators (MersenneTwister, Well generators) do not clear normal deviate cache on setSeed
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Key: MATH-723
URL: https://issues.apache.org/jira/browse/MATH-723
Project: Commons Math
Issue Type: Bug
Affects Versions: 2.2, 2.1, 2.0
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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[jira] [Resolved] (MATH-723) BitStreamGenerators (MersenneTwister,
Well generators) do not clear normal deviate cache on setSeed
Posted by "Phil Steitz (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phil Steitz resolved MATH-723.
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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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