Hi, I am using curve fitting tool to find a polynomial relationship Z = f(X,Y). Although a surface is well fitted to my X, Y, and Z data, whenever I plug in X and Y data to f(X,Y), the result is very different from the original value of Z. Why? Attached are three figures from polynomial curve fitting, representing the same thing with different angles. I would appreciate any ideas.
MATLAB: How to use polynomials after curve fitting 3D points
polynomial curve fitting 3d
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