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+//Example 4.18

+//Convolution sum of x[n] and h[n]

+clc

+clear

+n1=-100:0;

+n2=0:100;

+n3=-100:100;

+b=0.8//assume the constant b=0.4

+a=0.8//assume the constant a=0.8

+for i=1:length(n1)

+    x(i)=a^n1(i);

+    h(i)=b^n1(i);

+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,'.');