How to find first two largest peaks with sample location

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Muhammad Usman Gul
评论： Bhaskar R 2020-2-6
Please let me know, how to find its two highest peaks along with its samples information too.
P wave.JPG

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Bhaskar R
Bhaskar R 2020-2-6
d = rand(100,1); % assumed data
[vals,loc] = maxk(d,2); % first two peaks(mnaximum values) sample values and locations
plot(d); hold on; % plot original samples
plot(loc,vals,'rv', 'MarkerFaceColor', 'r'); % plot peak values
  2 个评论
Muhammad Usman Gul
Muhammad Usman Gul 2020-2-6
Your answer is work well iff and only if we are going to find out first-two maximum values. But here I would like to find out the first two largest peaks instead of maximum values. i.e in given figure, first and second peaks at 496 & 916 respectively. However, in your given function '"maxk" it will return 2nd maximum value which is a part of the first peak.
Thanks for your cooperation and I hope you got my point.
Bhaskar R
Bhaskar R 2020-2-6
Yeah, I got you. Use findpeaks to get all peak values of the samples
d = rand(100,1); % assumed data
[vals,locs] = findpeaks(d);
[val,loc] = maxk(vals,2); % first two peaks(mnaximum values) sample values and locations
plot(d); hold on; % plot original samples
plot(locs(loc),val,'rv', 'MarkerFaceColor', 'r'); % plot peak values

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