Using the DFT
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Script for matlab: clear all; t=0:.01:1; T=0.20; ts=0:T:1; f1=2; f2=1/0.125; x = sin(2*pi*3*t); %this is the function plot(t,x); % plot the original signal X = fft(x); % take the DFT pause (2); plot (t,X); %plot the DFT of the signal