I have three sets of x,y corresponding to three T values. For example for T1, I have x1,y1, x2,y2, ..... x8,y8 and the same for T2, and T3. The objective is to find a curve fit which is y=f(x,T). The nature of changes for y with respect to F is of the form (a.F^2+b.F+c) for a constant x and the nature of changes for y with respect to x for a constant F, is of the form AX^2+BX+C, however, the a and A and b, and B in these two equations are drastically different (positive and big value vs negative small value).
Please let me know which curve fitting command(s) I should try. I think I do have the toolkits needed as part of Matlab package.
Thanks in advance.