Estimates the signal width of data input, using definition:
rho = cumtrapz(t,x.^2)/trapz(t,x.^2)
The integration limits go from mean(t)-w/2 and mean(t)+w/2; w is defined as the signal width, and gives the time at which rho % of the signal is
captured. It is an informal measure of the localization of a signal.
Rho, in most applications, is ~90%.
Joshua Carmichael (2021). signalwidth.m (https://www.mathworks.com/matlabcentral/fileexchange/20686-signalwidth-m), MATLAB Central File Exchange. Retrieved .
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