I have this code, would like to get plot (b) instead of (a)
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n=2;
k=2;
delta=pi/120;
phi=0:0.0001:2*pi;
s=((2*pi*cos(phi)/k)+delta);
E=(sin(n*s/2))./(n*sin(s/2));
a=[phi,E];
plot(s);
figure;polar(phi, abs(E));
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