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+//Example 2_19 <b>
+//compute the Convolution of x[n] and Unit Impulse response h[n]
+clear;
+close;
+clc;
+Max_Limit=10;
+for n=1:Max_Limit
+Alpha=0.5;
+h=(0.4)^(n)*ones(1,Max_Limit);
+N1=0:Max_Limit-1;
+x(n)=(0.8)^(n-1);
+end
+N2=0:Max_Limit-1;
+y=convol(x,h);
+N=0:2*Max_Limit-2;
+figure
+a=gca();
+plot2d3('gnn',N2,x) 
+xtitle('Input Response Fig 2.5.(a)','n','x[n]');
+a.thickness=2;
+figure
+a=gca();
+plot2d3('gnn',N(1:Max_Limit),y(1:Max_Limit),5) 
+xtitle('Output Response Fig 2.7','n','y[n]');
+a.thickness=2;