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Nonlinear fit in MATLAB

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Cole Butler
Cole Butler 2019-6-27
评论： Cole Butler 2019-6-27
Hello all,
I am trying to fit a function with one data set to another data set. I'm performing a nonlinear fit similar to something as follows:
y = c1.*x.^c2
where y and x are two column vectors, and I am trying to solve for c1 and c2. Although it's a pretty straightforward answer, I thought some guidance from the community would be best in this matter as I've little experience with the nonlinear fitting capabilities of MATLAB.
Cheers
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Bjorn Gustavsson
Bjorn Gustavsson 2019-6-27
And if Walter's solution is not good enough, due to how noise in y is modified with the log, then use that solution to look for a minimization of
f = @(p,x,y) sum((y-p(1)*x.^p(2)).^2)
You can do that with fminsearc or, with minor modifications, lsqnonlin
Cole Butler
Cole Butler 2019-6-27
Thank you both for the suggestions!

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