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https://issues.apache.org/jira/browse/MATH-937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590463#comment-13590463
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Christoph Höger commented on MATH-937:
--------------------------------------
I had a look at TestProblem4. Here (in class Bounce) a sign variable is
introduced. This quirk seems to fix my problem too. This might be a problem
with the event detection funtion g.
The documentation states that:
> The switching function must be continuous in its roots neighborhood
So it needs to be continuous _after_ an event as well? The documentation should
clearly state that if it is the case IMO, since events are usually used to
implement non-continuous behavior in a system.
> NoBracketingException after event was found
> -------------------------------------------
>
> Key: MATH-937
> URL: https://issues.apache.org/jira/browse/MATH-937
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.1.1
> Reporter: Christoph Höger
> Attachments: ApacheCommonsBouncingBall.java,
> ApacheCommonsBouncingBallTest.java
>
>
> The BracketingNthOrderBrentSolver used by the EmbeddedRungeKuttaIntegrator
> fails, if an event is detected twice with a NoBracketingException.
> The problem lies in line EventState.java line 262 (version 3.1.1). Here the
> event detection function f is applied to an arbitrary choosen value of time.
> If the event detector crosses zero before this time, the solver throws the
> mentioned exception.
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