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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2011/04/25 11:12:05 UTC
[jira] [Created] (MATH-563) resetting relative and absolute
tolerances in ODE adaptive step size integrators
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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[jira] [Resolved] (MATH-563) resetting relative and absolute
tolerances in ODE adaptive step size integrators
Posted by "Luc Maisonobe (JIRA)" <ji...@apache.org>.
[ 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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