I have 4 matrices, X,Y & x,y. Can I use TFitter in order to produce 2 polyonyms to calculate X,Y from x,y? X(i)=f(x(i),y(i)) and Y(i)=f(x(i),y(i)).

Thanx in advance for any answer.

Hi,

I do not understand what you want to accomplish ! What is the

index i running over ?

Eddy