Writing vectors for exponetial equation

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Hamid Ahmadi
Hamid Ahmadi 2018-5-15
评论： Star Strider 2018-5-15
Hi, I' trying to fit my data that include 4 vectors in to this equation by using division function. However I don't know how to write D matrix. Here is my Equation.
F = a0 + a1*Em + a2*Ei*exp(a3*VF)
D = ?
U = D \ F

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Star Strider
Star Strider 2018-5-15
Your model is nonlinear, not linear, so you cannot use the mldivide,\ function or operator with it. (It is nonlinear because the partial derivative with respect to the ‘a3’ parameter is a function of itself, and also ‘a2’.) You will have to use a nonlinear parameter estimation function, such as nlinfit, lsqcurvefit, or fminsearch.
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Hamid Ahmadi
Hamid Ahmadi 2018-5-15
Thank you so much for providing this sample. I understood completely.

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