Unit Step function defined for negative time?
clear all; clc
t = -6:0.0001:6;
x = 2.5*(sign(t - -0.5) - sign(t - 0.5))/2;
y = - 2*(sign(t - -3) - sign(t - 0))/2 + 1.5*(sign(t - 0) - sign(t - 3))/2;
subplot(2,1,1)
plot(t, x, 'b', 'linewidth', 1.5)
grid on
xlim([-1.5 1.5])
ylabel('x(t)')
subplot(2,1,2)
plot(t, y, 'r', 'linewidth', 1.5)
grid on
xlabel('t')
ylabel('y(t)')
