lettere

E1=E;
%For E2, choose a random rotation between 0 and pi/3
theta=(pi/3)*0.787;
E2=E*exp(i*theta);
E3=0.2*E;
figure(1)
plot(real(E1),imag(E1),'b*-')
hold on
plot(real(E2),imag(E2),'g^-')
plot(real(E3),imag(E3),'ro-')
plot(real(E4),imag(E4),'ms-')
hold off
figure(2)
F1=fft(E1);
F2=fft(E2);
F3=fft(E3);
F4=fft(E4);
plot(abs(F1)/max(abs(F1)),'b*-'); hold on;
plot(abs(F2)/max(abs(F2)),'g^-');
plot(abs(F3)/max(abs(F3)),'ro-'); hold off