Best Poly Fit Coefficients do not match the best Poly Fit 2

Hello

I have dataset with 9 points and want to adapt or to solve linear equations with coefficient 9. The model - equation is then

Z = a0 + a1 * x + y * a2 + a3 * x ^ 2 + a4 * x * y * + a5 * y ^ 2 + a6 * x ^ 7 * x + 2 * y * y ^ 2 + a8 * x ^ 2 * y ^ 2; coefficient 9 total EQ.

When I create the matrix H and send data to 'General linear Fit' it returns coeffcients and the best fit. Better adapt works well but I don't know how to interpret a coeficients.

All the math of it works well when the function is second order polynom, for example, when there coefficient a0 to a5.

Thanks in advance.

Sasa

You're right, it works!

I fix error of 11 to 1, but also the algorithm must be "acquired" and then match.

Thank you!!!

Tags: NI Software

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