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MathGroup Archive 2002

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Re: Internal parameters of NDSolve, write-out of preliminary data

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34933] Re: Internal parameters of NDSolve, write-out of preliminary data
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 13 Jun 2002 02:38:25 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <ae6ptq$e3v$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

t1 = 0;
i = 0;
NDSolve[{y''[t] == -y[t], y[0] == 1, y'[0] == 0}, y[t], {t, 0, 20Pi}, 
  StoppingTest :> (i++; If[Mod[i, 10] == 0, Print[i," t->",t," dt->",t -
t1]]; t1 = t; False)]

Regards
  Jens

"Telley, Ivo Andreas" wrote:
> 
> Dear Mathematica cracks
> 
> I am looking for some parameter calls, if any exist at all, for the NDSolve
> function of Mathmatica 4.1:
> 
> I want to let the solver write out the actual step number and the point that
> it is calculating, say, for every 1000 steps. That way I could control more
> what the solver is doing and where it might be stuck (especially when
> solving almost singular problems).
> 
> Has anyone more experience with this Solver and possibilities to control the
> its actual state?
> 
> Thanks for helping me!
> 
> Ivo


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