How would I find the first twelve local maximum (peak) values for y and the corresponding times using a script?

How would I find the first twelve local maximum (peak) values for y and the corresponding times (t) using a script?

ANSWER

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If you don’t have the Signal Processing Toolbox, and since you have a clean, noise-free signal, this works:

x = linspace(0,20,250);             % Create Data
y = exp(-0.25*x) .* sin(2.5*pi*x);  % Create Data
dy = gradient(x,y);                 % Derivative: dy/dx
zx = dy.*circshift(dy, [0 -1]);     % Zero-Crossings Of Derivative
pkix = find(zx<0);                  % Zero-Crossing Indices
pkix = pkix(y(pkix)>0);             % Indices Of Peaks

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How would I find the first twelve local maximum (peak) values for y and the corresponding times…

How would I find the first twelve local maximum (peak) values for y and the corresponding times…