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How to fit data to my customized form automatically?

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Zhiting
Zhiting 2011-2-23
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.

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Jiro Doke
Jiro Doke 2011-2-23
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.

更多回答（1 个）

Paulo Silva
Paulo Silva 2011-2-23
doc polyfit
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Zhiting
Zhiting 2011-2-23
I want to fix p1 and p2 to be 0. I need y=p3*x^3+p0.

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