[Help-gsl] polynomial fitting using nonlinear least-squares fitting

[Lucas Grijander]

Hi all!

I have to model some 3D data by using multidimensional polynomials. I'm 
trying to use the nonlinear least-squares fitting functions from GSL. I'm 
not sure if it is the best option, but I'm having problemes of convergence. 
The polynomial function should be like this:

Z = f(X,Y)
Z = c0 + c1X + c2Y + c3X2 + c4Y2 + .....

How should I define the function to minimize in the code? the order of the 
polynomial is defined by the user, and it can be different for X and Y.

thanks for your help!

Fistroman.

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