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From luc <...@spaceroots.org>
Subject Re: [Commons-Math] RungeKuttaIntegrator first step too large
Date Wed, 21 Nov 2012 16:09:23 GMT
Le 2012-11-21 09:20, BIGNON Emmanuel a écrit :
> Hello,

Hi Emmanuel,

>
> I tried to integrate some equations using the RungeKuttaIntegrator
> class with an ending time within the first step. And it seems Commons
> Math does not adapt the first step size to match the ending time (It
> does it for next steps).
>
> I also noticed that this problem has been solved in issue MATH-727
> for Embedded Runge Kutta integrators (which has an adaptive step
> size).
>
> Did I miss something or is that normal that the Embedded Runge Kutta
> integrators performs the step size check on first step but the Runge
> Kutta Integrator does not?

It is not normal, it is a bug, thanks for reporting it.

Could you file a bug report in JIRA so we do not forget to fix it, with
a test case to reproduce the bug and ideally a patch to fix it?

best regards,
Luc

>
> Thanks for your time,
>
> Emmanuel


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