Hi , I have the signal x2(t)=|cos(10*pi*t)|.How can i calculate its period with matlab?I am new matlab so each help will be usefull
John Williams answered . 2024-12-21 16:03:03
use autocorrelation. If your data is periodic you should get high correlation once the lag time matches the period. here is an example:
x=0:0.1:20*2*pi;
y=sin(x); % so we know the period is 2*pi roughly 6.28
ac=xcorr(y,y);
[~,locs]=findpeaks(ac);
mean(diff(locs)*0.1)
ans =
6.2842
x=0:0.01:20*2*pi;
y=abs(cos(10*pi*x));
ac=xcorr(y,y);
[~,locs]=findpeaks(ac);
mean(diff(locs)*0.01)
ans =
0.1000
Another approach is using FFT, particularly if you have a more complex signal.
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