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Range Kutta 4 with variable steps

• To: mathgroup at smc.vnet.net
• Subject: [mg14325] Range Kutta 4 with variable steps
• From: Vincent DELAYE <vincent.delaye at wanadoo.fr>
• Date: Tue, 13 Oct 1998 01:21:37 -0400
• Organization: Wanadoo - (Client of French Internet Provider)
• Sender: owner-wri-mathgroup at wolfram.com

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)