I searched for surface fits, but didn't seem to find information I could use.
I am using the 7.1 Mac Version.
I have a set of x,y and z coordinates that I'd like to fit to a 2nd order equation using least squares (SVD), such that z=a+ bx+ cy+ dy^2 + exy + fx^2.
I am not sure how to go about it on 7.1 MAC version.
Any ideas are appreciated! Thanks.