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https://issues.apache.org/jira/browse/MATH-654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Steitz resolved MATH-654.
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Resolution: Fixed
Fixed in r1163875. ValueServer now exposes a reSeed method that when supplied a
fixed seed will generate a fixed sequence in any stochastic mode. The
RandomDataImpl that it uses internally is passed to the
EmpiricalDistributionImpl it creates when used in DIGEST_MODE. The changes for
this issue include an incompatible (vs. 2.x) change: the constructor for
EmpiricalDistributionImpl that previously took a RandomData now takes a
RandomDataImpl. The plan for 3.0 is to merge these.
> ValueServer not deterministic for a fixed random number seed
> ------------------------------------------------------------
>
> Key: MATH-654
> URL: https://issues.apache.org/jira/browse/MATH-654
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 1.1, 1.2, 2.0, 2.1, 2.2
> Reporter: David James
> Assignee: Phil Steitz
> Fix For: 3.0
>
>
> I have built an agent-based model using the Apache Commons Math library,
> which has come in handy.
> The ValueServer seemed particularly helpful, as explained at:
> http://commons.apache.org/math/userguide/random.html
> My simulation needs repeatable randomness, so I used this form of the
> ValueServer constructor:
> ValueServer(RandomData randomData)
> Construct a ValueServer instance using a RandomData as its source of
> random data.
> //
> http://commons.apache.org/math/api-2.2/org/apache/commons/math/random/ValueServer.html
> However, in my simulation, I found that the ValueServer did not act
> deterministically if I supplied the same random number seed.
> I have not inspected the source code, but I suspect that the ValueServer is
> not using the `randomData` generator correctly. If it was, then it should be
> deterministic.
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