is there's a way to automatically find peaks in an histogram?

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sani
sani 2020년 5월 28일
댓글: sani 2020년 5월 30일
Hello,
I have a script to analyze data from a detector (the data is not necessarily repeated). right now I have to find the peaks manually which is time-consuming!
is there's a way I can get the range of the peak base in the x-axis automatically? and is there's a way to neglect small peaks (let's say small in respect to the ratio from the max peak)?
here is an example of histogram I'm working with
  댓글 수: 2
Rik
Rik 2020년 5월 28일
Have you tried the findpeaks function?
sani
sani 2020년 5월 28일
yes but I couldn't applied it for histogram, just to my original data (and it dosn't relevant)

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Steven Lord
Steven Lord 2020년 5월 29일
You can do this using the islocalmax function.
% Sample data
rng default
x = randn(1, 1e5);
h = histogram(x);
% Retrieve some properties from the histogram
V = h.Values;
E = h.BinEdges;
% Use islocalmax
L = islocalmax(V);
% Find the centers of the bins that islocalmax identified as peaks
left = E(L);
right = E([false L]);
center = (left + right)/2;
% Plot markers on those bins
hold on
plot(center, V(L), 'o')
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Image Analyst
Image Analyst 2020년 5월 29일
How is islocalmax() different than findpeaks()? Is it just that it's in base MATLAB instead of the Signal Processing Toolbox?
sani
sani 2020년 5월 30일
thanks a lot Steven! it was really helpful:)

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