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//Example 4.16
//Convolution sum of x[n] and h[n]
clc
clear
n1=-100:-2;
n2=2:100;
n3=-98:98;
a=1/2//assume the constant a=1/2
for i=1:length(n1)
x(i)=a^-n1(i);
h(i)=1;
end
y=convol(x,h);
subplot(3,1,1)
xtitle("input signal x(n)","....................n","x[n]");
plot(n1,x,'.');
subplot(3,1,2)
xtitle("system response h(n)","....................n","h[n]");
plot(n2,h,'.');
subplot(3,1,3)
xtitle("output signal y(n)",".............................n","y[n]");
plot(n3,y,'.');
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