Fit data to a form other than a simple polynomial

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CGN
CGN 2015-10-30
回答： John D'Errico 2015-10-30
I am wondering if it's possible to fit data to fit data to a form than like c1*x^n+c2*x^n-1+...+cn*x+c. Instead, I want to fit data to an equation like c1*x^-3 and so on. How could I do this?

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John D'Errico
John D'Errico 2015-10-30
My polyfitn tool (on the file exchange) can do it of course. Or several tools from the curve fitting toolbox, the optimization toolbox, the stats tool box. You can do it trivially using backslash.
n = 100;
x = rand(n,1);
y = rand(n,1);
c = [ones(n,1),x,x.^-1]\y
c =
0.49905
-0.098795
0.0043635

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