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https://issues.apache.org/jira/browse/MATH-1275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles Sadowski updated MATH-1275:
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Fix Version/s: (was: 4.0)
4.X
> EventHandler and StepHandler interfaces do not provide derivatives
> ------------------------------------------------------------------
>
> Key: MATH-1275
> URL: https://issues.apache.org/jira/browse/MATH-1275
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Luc Maisonobe
> Priority: Major
> Fix For: 4.X
>
>
> The EventHandler and StepHandler interfaces allow passing the current state
> vector to user code, but not its derivatives. This is a pity because the
> integrator does know these derivatives as they are the basis from which
> everything else is computed. The data is lying around, just not passed to
> user.
> This is a design issue and as it affects user interfaces, it cannot be fixed
> before 4.0.
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