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Re: Range Kutta 4 with variable steps

• To: mathgroup at smc.vnet.net
• Subject: [mg14335] Re: [mg14325] Range Kutta 4 with variable steps
• From: "Jens-Peer Kuska" <kuska at linmpi.mpg.de>
• Date: Thu, 15 Oct 1998 00:28:41 -0400
• Sender: owner-wri-mathgroup at wolfram.com

Hi Vincent,

You don't need to write Your own RK-Method.

Look at the NDSolve[] function. It has an option Method that You can set
it to RungeKutta and You have a variable stepsize method.

Hope that helps
  Jens
-----Original Message-----
From: Vincent DELAYE <vincent.delaye at wanadoo.fr> To:
mathgroup at smc.vnet.net
Subject: [mg14335] [mg14325] Range Kutta 4 with variable steps


>Hi,
>
>I'm looking for a numerical method to solve non linear lasers equations
>systems :
>x'[t]=3D=3D(y[t]-z[t]-1)*x[t]
>y'[t]=3D=3Db-x[t]*y[t]
>z'[t]=3D=3D-x[t]*z[t]
>Range Kutta 4 method is provided by Mathematica, but with constant
>steps. Do you know how can I write Range Kutta 4 with variable steps
>with Mathematica ?
>
>Vincent DELAYE vincent.delaye at cea.fr Lti DSYS SCSI
>Grenoble (FRANCE)
>
>
>