MATLAB Answers

How can I find the width of the peaks when presented with a digital signal-like plot?

2 views (last 30 days)
My problem requires the measurement of the extent of these peaks (attached .fig and .jpg plot files) with respect to the base of the peaks (not FWHM).
For example, the first peak between (X=) 20 and 40 is spread across 32-36 X values. Therefore, my results should be 4.
This requires automation as it fits into a bigger problem statement I am working on.
Thank you in advance.

  0 Comments

Sign in to comment.

Accepted Answer

Daniel M
Daniel M on 11 Nov 2019
Edited: Daniel M on 11 Nov 2019
Use the pulsewidth function with the argument MidPercentReferenceLevel set to 0 or 1 (the lowest value). Here is an example:
x = 1:50;
y = zeros(size(x));
y(33:35) = 1;
width = round(pulsewidth(y,1,'MidPercentReferenceLevel',1,'Tolerance',0.1));
width =
4
Or, using your data:
H = openfig('Query.fig');
C = get(H,'Children');
x = C(4).XData;
y = C(4).YData;
width = round(pulsewidth(y,1,'MidPercentReferenceLevel',1,'Tolerance',0.1))
width =
4 5 6 5
Alternatively, if your data contains only ones and zeros:
start1 = strfind([0,y],[0 1]);
end1 = strfind([y,0],[1 0]);
width = end1-start1+2
width =
4 5 6 5

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by