代码：
n = 0:10; x = 10*(0.8) .^ n; y = cirshftt(x,6,15);
n = 0:14; x = [x, zeros(1,4)];
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%% START a
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figure('NumberTitle', 'off', 'Name', 'Exameple5.12 ')
set(gcf,'Color','white');
subplot(2,1,1); stem(n,x); title('Original sequence x(n)'); axis([-1,15,-1,11]);
xlabel('n'); ylabel('x(n)'); grid on;
subplot(2,1,2); stem(n,y); title('Circularly shifted sequence , N = 15'); axis([-1,15,-1,11]);
xlabel('n'); ylabel('x((n-6) mod 15'); grid on;
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%% END a
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运行结果：
