How to find major peak values and the avarage distance between them in a signal?

Question

Ekin 2013-8-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86017-how-to-find-major-peak-values-and-the-avarage-distance-between-them-in-a-signal

采纳的回答： Azzi Abdelmalek

I have a signal like this :

I want to:

Find and mark ONLY major positive peak points ( not the small peaks) on graph.
Find the avarage distance between them (these major positive peak values).
Find the peaks whose distance between is much different the avarage value.

Can anyone help with finding these values? Thanks in advance!

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Answer 1

Azzi Abdelmalek 2013-8-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86017-how-to-find-major-peak-values-and-the-avarage-distance-between-them-in-a-signal#answer_95554

在 MATLAB Online 中打开

%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))

%you can find the maximum distance

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Image Analyst 2013-8-30

But you've accepted two answers that tell you the same thing and now you're saying neither one works? Like the answer in your duplicate question said you might have to play around with the optional inputs to findpeaks(). Did you try that?

Ekin 2013-8-30

Yeah tried them; when i accepted my duplicate question, i wanted to mark only peak points and that link in answer solved my problem, so i accepted it.

In this question i had 3 more questions and all solved now, so accepted this one too ^^

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