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Re: NDSolve and differential equation system

• To: mathgroup at smc.vnet.net
• Subject: [mg54057] Re: NDSolve and differential equation system
• From: Christian Moosmann <some@Adress>
• Date: Wed, 9 Feb 2005 09:27:31 -0500 (EST)
• Organization: Rechenzentrum der Universitaet Freiburg, Germany
• References: <cu1vjh$ltj$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi again

Thanks for your suggestions, using Erf[] instead of UnitStep[] gains a 
factor of about 2, so this is a step to the right direction.


 > You can a) use the wonderful advanced interface of NDSolve[]
 > to use a constant step size

Sadly the IDA method does not support fixed step sizes. And - correct me 
if I am wrong - only the IDA method can solve differential algebraic 
equations.

 > However, if Ainv.K1 and Ainv.K2 commute

Thanks for your effort here, but sadly they don't :-(




Thanks again very much for your suggestions. Do you have some more?  ;-)

Christian