Storing the peak values of a fft
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I have produced a code that will analyse vibration data. What I want to do is record the peak values of the FFT and store them so I can produce a graph showing the peak values of various runs of vibration data.
1 commentaire
Adam
le 12 Fév 2018
What is your problem in doing this? Isn't it just
max( abs( y ) )
where y is your fft result for a given input?
Réponses (1)
Matt
le 12 Fév 2018
Hi Gavin
You can find local maxima by using the "findpeaks" function in MATLAB. Below is an example:
x = linspace(0,8*pi);
y = sin(x)./x;
[m,idx] = findpeaks(y);
plot(x,y)
hold on
plot(x(idx),y(idx),'ro')
hold off
You could apply this function to your fft output to find peaks.
Matt
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