Re: Precision when solving a system of differential equations
- To: mathgroup at smc.vnet.net
- Subject: [mg81841] Re: Precision when solving a system of differential equations
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 4 Oct 2007 04:34:35 -0400 (EDT)
- Organization: Uni Leipzig
- References: <email@example.com>
- Reply-to: kuska at informatik.uni-leipzig.de
you can't because NDSolve determine the step size from
the precision you set.
You can reduce the precision that NDSolve use but that
is usual not a good idea.
In a stiff equation one has typical to made some very small steps
but when the system relaxes the step size can grow. So
it is not a good idea to set a lower limit for the step
size. You should trust the step size control.
Marc VIAL wrote:
> I have a system with three differential equations with time as my variable.
> I would like to control the increment time step as some of my function are
> very stiff. Ideally I would like to use between 10 and 20 millions steps.
> How can I do that?
> (version used Mathematica 6.0.1)
> Thanks for help
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