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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-950) event state not updated if an unrelated event triggers a RESET_STATE during ODE integration
Date Tue, 19 Mar 2013 13:13:16 GMT
Luc Maisonobe created MATH-950:
----------------------------------

             Summary: event state not updated if an unrelated event triggers a RESET_STATE
during ODE integration
                 Key: MATH-950
                 URL: https://issues.apache.org/jira/browse/MATH-950
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.1.1
            Reporter: Luc Maisonobe
            Assignee: Luc Maisonobe
            Priority: Critical
             Fix For: 3.2


When an ODE solver manages several different event types, there are some unwanted side effects.

If one event handler asks for a RESET_STATE (for integration state) when its eventOccurred
method is called, the other event handlers that did not trigger an event in the same step
are not updated correctly, due to an early return.

As a result, when the next step is processed with a reset integration state, the forgotten
event still refer to the start date of the previous state. This implies that when these event
handlers will be checked for In some cases, the function defining an event g(double t, double[]
y) is called with state parameters y that are completely wrong. In one case when the y array
should have contained values between -1 and +1, one function call got values up to 1.0e20.

The attached file reproduces the problem.


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