Curve fitting of PSD?
5 次查看(过去 30 天)
显示 更早的评论
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
0 个评论
回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Parametric Spectral Estimation 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!