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diff --git a/692/CH2/EX2.27/P2_27.sce b/692/CH2/EX2.27/P2_27.sce
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+//EXAMPLE 2.27, convolution of an exponential sequence
+clear;
+clc;
+n=0:.5:5
+c=0.5;
+b=0.4;
+clf();
+figure(0);
+a=gca();
+a.x_location="origin";
+x = c^n;
+subplot(2,2,1);
+plot2d3(n,x,2);
+plot(n,x,'.r');
+xtitle('','n','x');
+h = b^n ;
+subplot(2,2,2);
+plot2d3(n,h,2)
+plot(n,h,'.r')
+xtitle('','n','h');
+N=0:.5:10;
+y = convol (x , h ); 
+subplot(2,2,3);
+plot2d3(N,y,2)
+plot(N,y,'.r')
+xtitle('convol(x,h)' ,'n','y');
+disp(y,'Convolution of the two exponential sequences is =')
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