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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-563) resetting relative and absolute tolerances in ODE adaptive step size integrators
Date Mon, 25 Apr 2011 09:47:05 GMT

     [ https://issues.apache.org/jira/browse/MATH-563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-563.
--------------------------------

    Resolution: Fixed

fixed in subversion repository as of r1096443

> resetting relative and absolute tolerances in ODE adaptive step size integrators
> --------------------------------------------------------------------------------
>
>                 Key: MATH-563
>                 URL: https://issues.apache.org/jira/browse/MATH-563
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.2
>            Reporter: Luc Maisonobe
>            Assignee: Luc Maisonobe
>            Priority: Trivial
>             Fix For: 3.0
>
>
> There is a limitation of the current implementation of ODE integrators with
> adaptive step size. For now, the tolerances that are used to adjust the step
> size are specified only at construction time and cannot be changed afterwards.
> However, these tolerances are highly problem-dependent and in fact the dimension
> of the problem (which is related to the dimension of the vectorial version of
> the tolerances) is specified only at integration time, not at construction time.
> So it would be interesting to add at the top-level hierarchy (abstract class
> AdaptiveStepsizeIntegrator) a few setters to allow users to change these
> tolerances after the integrator has been built. It seems the integrators by
> themselves were not documented as immutable (I first thought they were), so this
> change is probably harmless.
> There was a discussion on the developers mailing list about this feature here: http://markmail.org/thread/djrjpm5pwcgg3ev4

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