How to find first two largest peaks with sample location

Please let me know, how to find its two highest peaks along with its samples information too.

Answer 1

[Bhaskar R]

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

[Muhammad Usman Gul]

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]

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