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+//Example 4.11

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

+clc

+clear

+n=-1:1;

+n1=-2:2;

+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]");

+plot2d3('gnn',n,x,5);

+subplot(3,1,2)

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

+plot2d3('gnn',n,h,5);

+subplot(3,1,3)

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

+plot2d3('gnn',n1,y,5);