How to find first two largest peaks with sample location

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Muhammad Usman Gul 2020-2-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503953-how-to-find-first-two-largest-peaks-with-sample-location

评论： Bhaskar R 2020-2-6

采纳的回答： Bhaskar R

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

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Answer 1

Bhaskar R 2020-2-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503953-how-to-find-first-two-largest-peaks-with-sample-location#answer_414052

在 MATLAB Online 中打开

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

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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 2020-2-6

在 MATLAB Online 中打开

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