i can not get the convolution of two unit step signal correct
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%conv command
step = 0.01;
t1 = 0:step:3;
t2 = 3:step:5;
t = [t1 t2];
x1 = ones(size(t1));
x2 = ones(size(t2));
x = [x1,x2];
subplot(3,1,1)
plot(t,x,'m'),grid on
legend('x(t)')
subplot(3,1,2)
th = 0:step:4;
h1 = ones(size(th));
h2 = exp(-3).*th;
h = h2.*h1;
plot(th,h,'b'),grid on
legend('h(t)')
xlim([0 5])
subplot(3,1,3)
y = conv(x,h).*step;
yt = 0:step:6;
subplot(3,1,3)
plot(yt,y,'r'),grid on
legend('y(t)=x(t)*h(t)')
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