t=-5:.001:5;

y=-3.*sign(t).*exp(2i*pi*t+0.25*t);
subplot(2,1,1);

plot(t,real(y));
title('CT signal real');
xlabel('time');
ylabel('function output');




z=y.*rectangularPulse(t/4);
subplot(2,1,2);

plot(t,imag(y));
title('CT signal imaginary ');
xlabel('time');
ylabel('function output');




---------------------------------------------------
t=-5:.001:5;

y=-3.*sign(t).*exp(2i*pi*t+0.25*t);
z=y.*rectangularPulse(t/4);
subplot(2,1,1);
plot(t,real(z));
title('Rectangular Pulse Signal real ');
xlabel('time');
ylabel('function output');

subplot(2,1,2);
plot(t,imag(z));
title('Rectangular Pulse Signal imaginary ');
xlabel('time');
ylabel('function output');