N = 20;
n = [0:1:N-1];
M = 8;
w = [0.0, .1, .2, .8, .9, 1.0, 1.1, 1.2];
x = [];
for i=1:1:M,
    w0 = w(i)*pi;
    x(i,:) = cos(w0*n);
end

figure;
for i=1:1:8,
    tit = sprintf('x(n) = cos(%1.1f*pi)', w(i));
    subplot(4, 2, i);
    %plot(n, x(i,:));
    stem(n, x(i,:));
    xlabel('n'); ylabel('x(n)'); title(tit);
end