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+//Example 4.14

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

+clc

+clear

+n=0:100;

+n1=0:200;

+a=0.7//assume the constant a=0.7

+for i=1:length(n)

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

+    h(i)=1;

+end

+y=convol(x,h);

+subplot(3,1,1)

+xtitle("input signal x(n)","....................n","x[n]");

+plot(n,x,'.');

+subplot(3,1,2)

+xtitle("system response h(n)","....................n","h[n]");

+plot(n,h,'.');

+subplot(3,1,3)

+xtitle("output signal y(n)",".............................n","y[n]");

+plot(n1,y,'.');