Re: nonlinear differential equations

[Matteo Bettella]

I think you should have a look at lsode.
Regards,
Matteo

On Fri, 1 Jun 2001, Zwingel, Reinhold wrote:

> Hi,
> 
> how can I create a m-file for nonlinear differential equations?
> 
> e.g:
> 
> dx1/dt =  b1*u1 - a1*x1 -a2*x2*x3
> dx2/dt =  b2*u2 - a3*x2
> dx3/dt = -b3*u3 + a4*a2*x1*x2
> 
> u1, u2 and u3 are the input variables.
> 
> Which A-matrix can I use?
> 
> The value of a2 is constant for the beginning of the simulation.
> 
> Unfortunately the value of a2 is a nonlinear function of x2: a2 = f(x2)
> Is it possible to use Octave in this case? When yes: How?
> 
> Best regards
> 
> Reinhold Zwingel
> 
> P.S.: I am new at this group. Maybe these questions are too simple.
> 
> 
> 
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