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+//Example 4.10
+//Convolution sum of x[n] and h[n]
+clc
+clear
+n=0:2;
+n1=0:4;
+x=[0.5 0.5 0.5];
+h=[3 2 1];
+A=[x 0 0;0 x 0; 0 0 x];
+y=A'*h'
+disp("Convolution of x[n] and h[n] is...")
+disp(y)
+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,'.');