This is the core formula of discrete Fourier transform: it simply computes the amplitude and phase shift of fundamental or harmonics of a phase signal.
t = linspace(0,2*pi);
x = 2*cos(t + pi/2) - cos(3*t) + rand(size(t));
returns estimations of amplitudes/phases for the first four harmonics.
Dear François Beauducel; I have made HARMFIT to my timeseries data set. I want to get the get the equation of this fitted equation. How can i get the equation of this fitted equation with all coefficients?