Help with fitting code

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Birol Ozturk 2015-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/215240-help-with-fitting-code

编辑： Birol Ozturk 2015-5-5

Dear All,

I am new to MATLAB and I am trying to use the attached MATLAB code to fit the attached aSi.txt data. I saved the functions with proper names as separate .m files in the same folder. I am getting the below error message when I try to run it.

Your help will be appreciated.

Thank you.

Birol

Error using lsqncommon (line 66) The Levenberg-Marquardt algorithm does not handle bound constraints and the trust-region-reflective algorithm requires at least as many equations as variables; aborting.

Error in lsqnonlin (line 236) [xCurrent,Resnorm,FVAL,EXITFLAG,OUTPUT,LAMBDA,JACOB] = ...

Error in Lorenzian_fit_N_Econd (line 48) [p,resnorm]=lsqnonlin(fitfunc, p, lbl, ubl, options, freq, real(epsilon), imag(epsilon));

Error in aSiFIT (line 99) p = Lorenzian_fit_N_Econd(f1, Eps, p, lb, ub, only_plot, ImReRatio);