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+//Example 4.20
+//Convolution sum of x[n] and h[n]
+clc
+clear
+n1=0:5;
+n2=0:7;
+n3=0:12;
+a=0.8//assume the constant a=0.8
+for i=1:length(n1)
+    x(i)=1;
+end
+for j=1:length(n2)
+ h(j)=a^n2(j);
+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,'.');