Deriving the Fourier transform of cosine and sine ... In this answer, Jim Clay writes: ... use the fact that F{cos(x)}=δ(w−1)+δ(w+1)2 ... The expression above is ... ... <看更多>

Fs = 100; % large frequency to replicate continuous data (dt). t = 0:1/Fs:W-1/Fs;. N = length(t);. x = cos(2*pi*t);. % Fourier transform. f = -10:1/Fs:10;. ... <看更多>