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+//Example 4.16
+//Convolution sum of x[n] and h[n]
+clc
+clear
+n1=-100:-2;
+n2=2:100;
+n3=-98:98;
+a=1/2//assume the constant a=1/2
+for i=1:length(n1)
+    x(i)=a^-n1(i);
+    h(i)=1;
+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,'.');