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https://issues.apache.org/jira/browse/MATH-604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-604.
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Resolution: Fixed
Fixed in subversion repository as of r1139831
> optional dense output in ODE step handlers leads to weird results
> -----------------------------------------------------------------
>
> Key: MATH-604
> URL: https://issues.apache.org/jira/browse/MATH-604
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.2
> Reporter: Luc Maisonobe
> Assignee: Luc Maisonobe
> Fix For: 3.0
>
>
> The requiresDenseOutput method defined in the StepHandler interface was first
> created as an optimization feature to avoid calling computeDerivatives too
> many times for some integrators. In fact, only Dormand-Prince 8 (5,3) needs
> it because we can save 3 calls per step when the interpolator is not used.
> This feature brings more problems than it solves:
> * it forces users to implement this method despite its purpose is not clear,
> * even if the method returns false, sometimes dense output will be generated
> (in fact when there are events detectors),
> * it creates problems with at least Gragg-Bulirsch-Stoer since this
> integrator really needs interpolation,
> * it will create the same problems for Adams integrators (they also need
> interpolation),
> * this "optimization" is useful only for one integrator: Dormand-Prince 8
> (5,3),
> * in many cases, even for Dormand-Prince 8 (5,3) it does not optimize
> anything since people will often need interpolation
> So I would like to completely remove this.
> Removing the method is backward compatible for users.
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