How do I get the error of a fitting function?
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I've written a function that does a Lorentzian fit on a set of data. I want to calculate an error bar for the accuray of this fit with respect to the x coordinates (the parameter Wavelength). Is this a built in command or is it more difficult?
function [params, Wavelength, Intensity, wavpeak]=SpectrumPeakFitCSV(filename)
SpectrumData=csvread(filename);
Wavelength=SpectrumData(2:end-1,1);
Intensity=SpectrumData(2:end-1,2);
Max = max(Intensity);
peak = find(Intensity==Max(1));
wavpeak = Wavelength(peak(1));
fun=@(x,Wav)Lorentzian(x(1),x(2),x(3),Wav)+x(4);
dark=Intensity(1);
opts = optimset('Display','off');
x=lsqcurvefit(fun,[Max(1),1,wavpeak,dark],Wavelength,Intensity,[0.5*Max(1) 0 wavpeak-0.2 0.9*dark],[2*Max(1) 3 wavpeak+0.2 1.5*dark],opts);
params=x; %scale, width, centre, dark
end
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Star Strider
2019-1-14
If I understand correctly what you want to do, the Statistics and Machine Learning Toolbox function nlpredci (link) is likely what you are looking for. Use the ‘jacobian’ output (last output) from lsqcurvefit with it.
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