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From: "John D'Errico" <woodchips@rochester.rr.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: simple parameter estimation
Date: Fri, 10 Oct 2008 02:42:02 +0000 (UTC)
Organization: John D'Errico (1-3LEW5R)
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"Marcio " <marciobarbalho@yahoo.com> wrote in message <gcmc12$514$1@fred.mathworks.com>...
> > Suppose you knew the parameters in question?
> > Could you solve the system, predicting y1, y2,
> > y3? Yes, since you would use an appropriate ode
> > solver, like ode45, etc.
> 
> I don't know the parameters in question. I did not understand what you said, I am trying to find a, b and c, all I know are the "responses", y1, y2 and y3. So, how'd you use ode45 to find the parameters a, b and c?
> of course I could give a starting guess if necessary, or a typical solution, as they say!
> Many thanks in advance!

Then I guess it is time for you to learn what
nonlinear regression is. If you have the
optimization toolbox,

help lsqnonlin
help lsqcurvefit

John