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MathGroup Archive 2000

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Re: Fixed Time Step for NDSolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23032] Re: Fixed Time Step for NDSolve
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 13 Apr 2000 02:43:21 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8d0ri8$57o@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

probably not. I would not advice to remove the step size control.
Typical a inital value solver with constant steps take more steps
and accumulate more rounding errors than a solver with stepsize control.

You can still use the InterpolationFunction[] that comes out form
NDSolve[]
to create a table of data with constant increment.

Or you may have a look into the ProgrammingInMathematica`RungeKutta.m
package that make a constant stepsize integration.

Regards
  Jens


jim_greer at my-deja.com wrote:
> 
> Is there any way to "trick" Mathematica into using a fixed time step
> over an interval of time for NDSolve?  I've tried various combinations
> of parameters on step size with no success.
> 
> Jim Greer
> Dept of Engrng Mech
> U.S. Air Force Academy
> 
> Sent via Deja.com http://www.deja.com/
> Before you buy.


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