% % Filename: example8.m % % Description: m-file to plot magnitude spectrum of % f[k]=u[k+2]-u[k-3]. % clear; clf; W = -3*pi:0.01:3*pi; % define DT frequencies Fa = 1 + 2*cos(W) + 2*cos(2*W); % plot |F(W)| from cosines subplot(2,1,1); plot(W,abs(Fa)); xlabel('\Omega '); ylabel('|F(\Omega)|'); title('DTFT of f[k]=u[k+2]-u[k-3] (from sum of cosines)'); Fb = sin(2.5*W)./sin(W/2); % plot |F(W)| sinc-like function subplot(2,1,2); plot(W,abs(Fb)); xlabel('\Omega '); ylabel('|F(\Omega)|'); title('DTFT of f[k]=u[k+2]-u[k-3] (from sinc-like function)');MATLAB Plot Generated: