How to find the width of plotted graph at selected Y-axis level?

10 views (last 30 days)
I want to measure the width of each signal at the y-axis's 20(TE reflection efficiency). Could you please help me with that code?

Sign in to comment.

Accepted Answer

Star Strider
Star Strider on 19 Oct 2020
Try this:
lambda = linspace(0.4, 0.6); % Wavelength Vector
s = sinc(((0.47:0.02:0.55).' - lambda)*1E+2)*30; % Signal Matrix (Row Vectors)
for k = 1:size(s,1)
[maxv,idx] = max(s(k,:)); % Index Of Peak
idxv1 = idx+[-2 0];
lmda(k,1) = interp1(s(k,idxv1), lambda(idxv1), 21, 'pchip'); % Interpolate Rising Edge
idxv2 = idx+[0 2];
lmda(k,2) = interp1(s(k,idxv2), lambda(idxv2), 21, 'pchip'); % Interpolate Falling Edge
wdth(k) = lmda(k,2) - lmda(k,1); % Calculate Width
hold on
for k = 1:size(s,1)
hp = plot(lambda, s(k,:));
plot(lmda(k,:), [1 1]*21, '+', 'Color',hp.Color) % Plot ‘+’ In Same Color As Signal
hold off
Make appropriate changes to get my code to work with your signals. It may require some ‘tweaking’, however it should produce reasonable results.

More Answers (0)


Community Treasure Hunt

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

Start Hunting!