Question About Statistics ToolBox

[6543210000]

Hello

How can obtain equation of f(x_1, x_2)= y, with
x_1, x_2 and y ??
(with statistics ToolBox => Polynomial fiitting tool,
nonlinear fitting tool, ....)

Thank You
Mahdi Heidari

 

[IRstuff]

In general, you can't.

You MUST have some idea about the general form of the equation. Only then, can you apply least squares or other weighting to find the appropriate parameters for the equation you choose.

TTFN

 

[6543210000]

At first thank you.

Then :
I have idea about form of equation. For Example
it is sth like below :
y = x_1^2+b+x_2^2+c

But after that how can find b and c ?? And obtain equation.

Thank you
Mahdi

 

[IRstuff]

There is a help file on multiple regression in Matlab

TTFN