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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-558) resetting relative and absolute tolerances in ODE adaptive step size integrators
Date Mon, 25 Apr 2011 13:19:05 GMT

     [ https://issues.apache.org/jira/browse/MATH-558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-558.
--------------------------------

    Resolution: Duplicate

duplicated by issue MATH-663
sorry for having created it twice :-(

> resetting relative and absolute tolerances in ODE adaptive step size integrators
> --------------------------------------------------------------------------------
>
>                 Key: MATH-558
>                 URL: https://issues.apache.org/jira/browse/MATH-558
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.2
>            Reporter: Luc Maisonobe
>            Assignee: Luc Maisonobe
>             Fix For: 3.0
>
>
> The current implementation of ODE integrators with adaptive step size has a major limitation.
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.
> It would be nice 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, so this change is
probably harmless.

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