Thread Subject: matlab code for nonlinear regression

I am wroking on a problem that requires me to use the nonlinear regression for estimation parameters.
I need matlab code?
Thanks

On Mar 15, 10:36 am, "yasin level" <pdf.a...@yahoo.fr> wrote:
> I am wroking on a problem that requires me to use the nonlinear regression for estimation parameters.
> I need matlab code?
> Thanks

To answer your question:
Yes, you need Matlab code.

As to what Matlab code you need, I cannot tell from the details you
have supplied.

"yasin level" <pdf.amir@yahoo.fr> wrote in message <hnjksa$dcr$1@fred.mathworks.com>...
> I am wroking on a problem that requires me to use the nonlinear regression for estimation parameters.
> I need matlab code?
> Thanks

I have 2 parameters in my equation for ex:
X = P1 P2 Y
I mesure data X and Y form experimental.
I need matlab code for fitting and estimation of my parameters with coef of regression.
thank you

On Mar 15, 11:24 am, "yasin level" <pdf.a...@yahoo.fr> wrote:
> "yasin level" <pdf.a...@yahoo.fr> wrote in message <hnjksa$dc...@fred.mathworks.com>...
> > I am wroking on a problem that requires me to use the nonlinear regression for estimation parameters.
> > I need matlab code?
> > Thanks
>
> I have 2 parameters in my equation for ex:
> X = P1 P2 Y
> I mesure data X and Y form experimental.
> I need matlab code for fitting and estimation of my parameters with coef of regression.
> thank you

That equation is linear, so you should able to solve it for P1*P2
using the method in your textbook.
But there are an infinite number of possibilities for P1 and P2.

 I am wroking on a problem that requires me to use the nonlinear regression for estimation parameters.
I have 3 parameters in my equation:
x=a+b.exp(-ct)
I have data x and t
I need matlab code for fitting and estimation of my parameters with coef of regression.
Thanks

On 3/16/2010 7:30 AM, yasin level wrote:
> I am wroking on a problem that requires me to use the nonlinear
> regression for estimation parameters.
> I have 3 parameters in my equation:
> x=a+b.exp(-ct)
> I have data x and t
> I need matlab code for fitting and estimation of my parameters with coef
> of regression.

Yasin, there are functions in the Statistics and Optimization Toolboxes specifically designed for nonlinear regression: NLINFIT and LSQCURVEFIT. The Curve Fitting Toolbox is an entire product designed to do nonlinear regression. If you don't have access to any of those, you can use FMINSEARCH to minimize an objective function that is the sum of squared errors for you regression. I imagine there are also tools available on the MATLAB Central File Exchange.

Hope this helps.