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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,'.');