Curve fitting of PSD?
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Hello, I need help for the curve fitting. I am using the following command but there is some problem with it.
NFFT=2^nextpow2(L);
Y1=fft(y-mean(y))/L; % Y1 is FFT
fc=Fs/2*linspace(0,1,NFFT/2+1);
Y2=2*abs(Y1(1:NFFT/2+1));%absolute value of FFT
Nc=(Y2).^2; % Nc is PSD
plot(fc,Nc);
g1=fittype('a1-x*p1', 'coef',{'a1','p1'});
options=fitoptions('Method','nonlinearleastsquares','lower',[-25 0], 'upper',[-5 4]);
options.startpoint=[-12,1];
options.TolFun=1e-12;
loglog(fc(1:length(fc)), Nc(1:NFFT/2+1),'b');
curvec= FIT(log10(fc(1:length(fc))),log10(Nc(1:NFFT/2+1)),g1);
=------------------------------- could you please tell me what is wrong with the command?
Thanks
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