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+//Example 5.7
+// overlap and add method 
+clc;
+clear;
+close;
+x=[1,2,3,4,5,1,2,3,4,5,1,2,3,4,5];
+h=[3,2,1,1];
+L=5;
+M=length(h);
+N=1:L+M-1;
+n=length(N);
+
+h1=[h,zeros(1:4)];
+
+x1=[x(1:L),zeros(1:3)]; 
+x2=[x(6:2*L),zeros(1:3)];
+x3=[x(11:3*L),zeros(1:3)];
+
+//Convolution 
+y1=convol(x1,h1);
+y2=convol(x2,h1);
+y3=convol(x3,h1);
+
+//Display sequence y[n] in command window
+for i=1:5
+    y(i)=y1(i)
+end
+for i=6:8
+    y(i)=y1(i)+y2(i-L)
+end
+for i=9:10
+    y(i)=y2(i-L)
+end
+for i=11:13
+    y(i)=y2(i-L)+y3(i-2*L)
+end
+for i=14:18
+    y(i)=y3(i-2*L)
+end
+
+disp( "The convolution of x[n]=[1,2,3,4,5,1,2,3,4,5,1,2,3,4,5] and h[n]=[3,2,1,1] is ");
+disp(y,"y[n]=")