MATLAB: How to fit data to the customized form automatically

curve fittingCurve Fitting Toolbox

I have quite a few sets of data and I want to fit them to y=a-b*x^3. I know that I could use cftool and do it manually for each data set. But it is really tedious. Is it a better way to do it? Thanks a lot.

Best Answer

Since you're already using Curve Fitting Toolbox, use the underlying functions: fitttype and fit.
Example:
f = fittype('a-b*x^3', 'independent', 'x', 'coefficients', {'a', 'b'});
fitobj =  fit(rand(10,1), rand(10,1), f)
Alternatively, you can generate MATLAB code from cftool.
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