CODEWITHSUNDEEP
matlabhistogram
user951487
user951487

Reputation: 855

Find the highest unknown number of peak points in Matlab

I want to find the highest peak points in the below histogram. For example as it is seen in the figure, I should select 4 peak points, but I get this 4 points information after seeing the histogram, so I need to find it by coding. Is there any method or algorithm to solve this problem?

enter image description here

If I select manually I could solve the problem. However, I do not know the number of the highest peak points. Actually the main problem is determining a threshold.

[pks,locs] = findpeaks(difference)
[sortedX,sortingIndices] = sort(difference,'descend');
locsize=size(locs,2);
counter=1;
peak_order=[];
while counter<5
    for j=1:locsize
        if sortingIndices(counter)==locs(j)            
            peak_order(counter)=sortingIndices(counter);
            counter=counter+1;
        end
    end
end

sorted_peak_order=sort(peak_order)enter code here

Upvotes: 0

Views: 120

Answers (1)

Laure
Laure

Reputation: 373

findpeaks has a series of options to refine your results. In your case, the option 'MinPeakProminence' should work; it thresholds according to the prominence of a peak to its neighbors.

[pks,locs] = findpeaks(difference,'MinPeakProminence',0.25*max(difference))

Upvotes: 2

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