FFT \ Peak points

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LALE ASIK
LALE ASIK 2018-3-9
编辑： LALE ASIK 2018-4-7
I am trying to find peak points of Fast Fourier transform (FFT). The graph looks like this:
Could you please help me to fix it?
% amplitude peaks
pks= findpeaks(mx(1:nfft/2));
n=min(n,length(pks));
pks_sort=sort(pks,'descend');%vector of spikes
for k = 1:n
locs=find(mx(1:nfft/2)==pks_sort(k));
f(k)=f_Axis(locs);
end

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采纳的回答

Akira Agata
Akira Agata 2018-3-9
Please change the 'amplitude peaks' section of your code to the following:
% amplitude peaks
[pks,locs] = findpeaks(mx(1:nfft/2),'SortStr','descend');
n = min(n,length(pks));
subplot(2,1,2);
plot(f_fft,mx)
hold on
plot(f_fft(locs(1:n)),pks(1:n),'rv','MarkerFaceColor','r')
xlabel('Frequency ')
ylabel(' Amplitutde')

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