t = [1:0.1:7];
epoch1 = 0.5*cos(pi*t) + 1.5*cos(4*pi*t) + 4*cos(5*pi*t);
epoch2 = 0.7*cos(pi*t) + 2.1*cos(4*pi*t) + 5.6*cos(5*pi*t);
epoch3 = 1.5*cos(2*pi*t) + 4*cos(8*pi*t);
epoch4 = 1.5*cos(pi*t) + 4*cos(4*pi*t);
epoch5 = 0.5*cos(pi*t) + 1.7*cos(2*pi*t) + 3.7*cos(5*pi*t);
epoch6 = 2.3*cos(3*pi*t) + 7.8*cos(8*pi*t);
epoch7 = 0.8*cos(pi*t) + cos(3*pi*t) + 3*cos(5*pi*t);
y=[epoch1 epoch2 epoch3 epoch4 epoch5 epoch6 epoch7];
figure;
plot([1:length(y)]*0.1,y)
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