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How to find out distance among peaks from a plot?

Asked by Zara Khan on 5 Jul 2018
Latest activity Answered by Rahul punk on 15 Mar 2019
some binary intensity values have stored in a profile and has been plotted. And getting some peaks from it. Here plot function has been used. How to find out distance among the peaks?

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doc findpeaks
if you have the Signal Processing toolbox
Yes. But distance I am not able to find

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2 Answers

Answer by Wooshik Kim on 5 Jul 2018

findpeaks gives you location of the peak as well
[pks,locs] = findpeaks(PeakSig,x);
dist = locs(2) - locs(1); %or whichever two peaks you want to know about

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For different different graphs I am getting different different peaks. after counting no of peaks I want to find out distance between each of them means distance between first and second, between second and third and so on. How to do that ?
diff( locs )

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Answer by Rahul punk on 15 Mar 2019

%If y is your signal
x=10:0.1:100;
y=100*cos(x)./x;
plot(x,y)
% you have to specify what is the major peak
min_peak=2
[peaks,idx1]=findpeaks(y)
% Major peaks and indices
[major_peaks, index]=find(peaks>=min_peak)
indices=idx1(index)
%distances
distances=mean(diff(indices))

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