How to find fwhm for each peak?

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fitri zabudin
fitri zabudin 2021-2-10
评论： Star Strider 2021-9-19
this is my coding in matlab. A is the result from picoscope. the result get from detecting lightning signal.
y = A(:,1);
x = (-0.6:4.000000046744390e-07:1.4);
plot(x,y)
title("FA-31")
ylabel("voltage(V)")
xlabel("time(s)")
vmax = max(y);
vmin = min (y);
%Find the half max value.
halfMax = max(y) / 2;
% Find where the data first drops below half the max.
index1 = find(y >= halfMax, 1, 'first');
% Find where the data last rises above half the max.
index2 = find(y >= halfMax, 1, 'last');
fwhm = index2-index1 + 1; % FWHM in indexes
% if you have an x vector
fwhmx = x(index2) - x(index1);
The formula I use in matlab for find fwhm is I get from Internet. Can u help me how to get the fwhm for all peak?
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Image Analyst
Image Analyst 2021-2-10
What's your definition of "peak"? How many do you say are there? Do you want to attach "A" so we can try things with your actual data?
save('answers.mat', 'A');
Then attach 'answers.mat' with the paper clip icon.
fitri zabudin
fitri zabudin 2021-2-12
编辑：fitri zabudin 2021-2-12
@Image Analystthis is my actual data for "A" and the picture is the peak that I mean

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Star Strider
Star Strider 2021-2-10
The Signal Processing Toolbox findpeaks function can return the FWHM of every peak. See the documentation sections on Determine Peak Widths and w for the necessary details. To return only the results from the largest or most prominent peaks, other name-value pair arguments will allow selections based on these (and other) criteria.
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Braulio Rodriguez
Braulio Rodriguez 2021-9-19
编辑：Braulio Rodriguez 2021-9-19
I'm interested on the broad peak. The peaks between roughly 0-5 pixels mess up my FWHM calculation. I cannot exclude these peaks on the basis of sole intensity, as the intensity varies from picture to picture, but the location of the first 'artificial' peaks are always approx. on the same range.

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