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How can I "perturbate" a NDSolve expresion?

• To: mathgroup at smc.vnet.net
• Subject: [mg102000] How can I "perturbate" a NDSolve expresion?
• From: Iván Lazaro <gaminster at gmail.com>
• Date: Sun, 26 Jul 2009 03:54:29 -0400 (EDT)

Hi all!

I'm trying to make a perturbation to a equation while NDSolve is doing his
job.

Suppose the equation is x'[t]=A*F(x[t]); where A is a parameter matrix, and
x'[t] are n-dimensional variables; i need that when integration time is, for
example, 10, the parameters change in some amount. Another posibility is
that each time step I generate a random number, and if it is less than
0.001, the parameters change in some amount.

Is it possible using NDSolve, or I have to write the integrator routine?

Thanks!

• Follow-Ups:
  • Re: Re: How can I "perturbate" a NDSolve
    • From: Iván Lazaro <gaminster@gmail.com>
  • Re: Re: Re: Re: How can I
    • From: Iván Lazaro <gaminster@gmail.com>
  • Re: Re: How can I "perturbate" a NDSolve
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: Re: Re: How can I "perturbate" a
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: Re: Re: How can I "perturbate" a
    • From: Pratip Chakraborty <pratip.chakraborty@gmail.com>
  • Re: Re: Re: How can I "perturbate" a
    • From: Pratip Chakraborty <pratip.chakraborty@gmail.com>
  • Re: Re: How can I "perturbate" a NDSolve
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: How can I "perturbate" a NDSolve expresion?
    • From: Iván Lazaro <gaminster@gmail.com>