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Re: Passing parameters to ODEs
From: |
Geordie McBain |
Subject: |
Re: Passing parameters to ODEs |
Date: |
Mon, 24 Nov 2003 13:25:50 +1100 |
> I am new to Octave and been trying to run my Matlab code under it.
> Can I pass parameters to ODEs without using globals? I tried this
> with ode45, but it didn't work. I looked the help for lsode and it
> also does not give me such an option. Is there a way to do it?
> Also, are there any optimization routines that allow me to pass
> parameters to the objective functions without using globals?
> Sincerely,
> Marcus Vinicius Eiffle Duarte
Here are two ways to pass parameters to ODEs.
1) Say the ODE depends on a parameter p. Append p as a dependent
variable and give it the evolution equation dp/dt=0 and the
appropriate initial condition.
2) Try Octave's odessa function instead of lsode. Call is
[X, SX, ISTATE, MSG] odessa (FCN, X_0, P, SX_0, T, T_CRIT)
where P is a vector of parameters; see under `Differential
Equations/Ordinary Differential Equations' in the manual for more
information.
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