?? ex050200.m
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% Chapter 5: Example 5.02%L = 5; N = 20;x = [ones(1,L), zeros(1,N-L)];xn = x' * ones(1,3);xn = (xn(:))';n = -N:1:2*N-1;subplot(1,1,1);subplot(2,1,2);stem(n,xn); xlabel('n'); ylabel('xtilde(n)')title('Three periods of xtilde(n)')axis([-N,2*N-1,-0.5,1.5])%print -deps2 fg0502.eps%subplot(1,1,1)% Part (b)1L = 5; N = 20;xn = [ones(1,L), zeros(1,N-L)];Xk = dfs(xn,N);magXk = abs([Xk(N/2+1:N) Xk(1:N/2+1)]);k = [-N/2:N/2];subplot(2,2,1); stem(k,magXk); axis([-N/2,N/2,-0.5,5.5])xlabel('k'); ylabel('Xtilde(k)')title('DFS of SQ. wave: L=5, N=20')% Part (b)2L = 5; N = 40;xn = [ones(1,L), zeros(1,N-L)];Xk = dfs(xn,N);magXk = abs([Xk(N/2+1:N) Xk(1:N/2+1)]);k = [-N/2:N/2];subplot(2,2,2); stem(k,magXk); axis([-N/2,N/2,-0.5,5.5])xlabel('k'); ylabel('Xtilde(k)')title('DFS of SQ. wave: L=5, N=40')% Part (b)3L = 5; N = 60;xn = [ones(1,L), zeros(1,N-L)];Xk = dfs(xn,N);magXk = abs([Xk(N/2+1:N) Xk(1:N/2+1)]);k = [-N/2:N/2];subplot(2,2,3); stem(k,magXk); axis([-N/2,N/2,-0.5,5.5])xlabel('k'); ylabel('Xtilde(k)')title('DFS of SQ. wave: L=5, N=60')% Part (b)4L = 7; N = 60;xn = [ones(1,L), zeros(1,N-L)];Xk = dfs(xn,N);magXk = abs([Xk(N/2+1:N) Xk(1:N/2+1)]);k = [-N/2:N/2];subplot(2,2,4); stem(k,magXk); axis([-N/2,N/2,-0.5,7.5])xlabel('k'); ylabel('Xtilde(k)')title('DFS of SQ. wave: L=7, N=60')%print -deps2 fg0502b.eps?? 快捷鍵說明
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