Using lsqcurvefit with constant parameters

Question

Chris 2014-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/143248-using-lsqcurvefit-with-constant-parameters

评论： Chris 2014-7-25

Hi, I am trying to use lsqcurvefit to fit data to an interference function that I created. The problem is that some of the parameters in the function should remain constant through the fitting process (ie. the wavelength of the laser does not change etc...). I have seen some other stabs at this but none that were thorough and actually worked when I ran them. Here is some of my code so you know what I am talking about:

initials = [Aref,Aprobe,w0,z,lambda,phi,x0,y0];
fitfunc = @(initials,x) InterferePhase1(initials,X2);
fitparams = lsqcurvefit(fitfunc,initials, X2 ,imageArray,[], []);

Ideally, I should be able to run this fit and have my initial values for lambda, x0, and y0 stay the same after lsqcurvefit runs.

Let me know if you need any additional information!

Thanks for all your help!

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Answer 1

Matt J 2014-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/143248-using-lsqcurvefit-with-constant-parameters#answer_146338

编辑：Matt J 2014-7-24

在 MATLAB Online 中打开

 initials = [Aref,Aprobe,w0,z,phi];
 fitfunc = @(p,pdata) InterferePhase1([p(1:4),lambda,p(5),x0,y0],pdata);
 fitparams = lsqcurvefit(fitfunc,initials, X2 ,imageArray);

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Matt J 2014-7-24

As you can see, though, my proposed fitfunc does pass 8 inputs to InterferePhase1 (that was the whole point). It embeds the 5 unknowns in an 8-vector which includes lambda, x0, and y0.

Chris 2014-7-25