Finding position of main peak and difference between main peak and next peak in a 1d plot

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How to find the position of main peak in a 1 d plot
Then how to find the value of the difference between the main peak and the next peak in the same plot.

Accepted Answer

Star Strider
Star Strider on 28 May 2021
x = linspace(0,10);
y = 1.5*exp(-(x-2).^2) + 2*exp(-(x-7).^2*2.5) + exp(-(x-9).^2*5);
[pks,locs] = findpeaks(y)
pks = 1×3
1.4994 1.9954 0.9996
locs = 1×3
21 70 90
[maxpk,idx] = max(y)
maxpk = 1.9954
idx = 70
figure
plot(x, y)
hold on
plot(x(locs), pks, '^r')
hold off
Result = table(pks(:),locs(:),(locs(:)-idx),(x(locs(:))-x(idx)).', 'VariableNames',{'Peaks','Indices','Index_Difference','X_Difference'})
Result = 3×4 table
Peaks Indices Index_Difference X_Difference _______ _______ ________________ ____________ 1.4994 21 -49 -4.9495 1.9954 70 0 0 0.99959 90 20 2.0202
.

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