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From Christoph Höger (JIRA) <j...@apache.org>
Subject [jira] [Updated] (MATH-937) NoBracketingException after event was found
Date Thu, 28 Feb 2013 11:51:15 GMT

     [ https://issues.apache.org/jira/browse/MATH-937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christoph Höger updated MATH-937:
---------------------------------

    Attachment: ApacheCommonsBouncingBallTest.java
                ApacheCommonsBouncingBall.java

A model and a Junit test case that demonstrate the problem.
                
> 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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