Peak finder - finding major peaks instead of just the smaller ones

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Bran 2014-1-16

编辑： Russ 2021-12-27

I want to use a peak finder to find the major peaks in my spectrum, however, when I use {pks, locs] = peakfinder()

I get all the small peaks as well. I just want the main five

Greg Dionne 2015-4-14

You can do:

findpeaks(y,'NPeaks',5,'SortStr','descend')

This gets you the five with the largest amplitude. If you want the five with the largest prominence, you can do:

[pks,locs,~,prm] = findpeaks(y);
[~,i] = sort(prm,'descend');
plot(1:numel(y),y,'-',locs(i(1:5)),y(locs(i(1:5))),'o ')

Russ 2021-12-27

编辑：Russ 2021-12-27

how would you do this to find the five minimum peaks?

i.e. within acceleration data, the most prominent negative peaks

Azzi Abdelmalek 2014-1-16

minimum_peak=10 % For example
[pks,locs]=findpeaks(your_signal,'MINPEAKHEIGHT',minimum_peak)

Azzi Abdelmalek 2014-1-16

You need some criterion to get rid of unwanted peaks

José-Luis 2014-1-16

You could also transform your data prior to detecting the peaks. Maybe a log transform would be enough?

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