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diff --git a/3812/CH6/EX6.18/6_18.sce b/3812/CH6/EX6.18/6_18.sce
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+//Example6.18:
+//Find and sketch the  Fourier Transform 
+clc;
+N = 5;
+N1 = -3*N:3*N;
+xn = [zeros(1,N-1),1];
+x = [1 xn xn xn xn xn xn];
+ak = 1/N;
+XW = 2*%pi*ak*ones(1,2*N);
+Wo = 2*%pi/N;
+n  = -N:N-1;
+W = Wo*n;
+figure
+subplot(2,1,1)
+a = gca();
+a.y_location ="origin";
+a.x_location ="origin";
+plot2d3('gnn',N1,x,2);
+poly1 = a.children(1).children(1);
+poly1.thickness = 3; 
+xlabel('n');
+title('Periodic Impulse Train')
+subplot(2,1,2)
+a = gca();
+a.y_location ="origin";
+a.x_location ="origin";
+plot2d3('gnn',W,XW,2);
+poly1 = a.children(1).children(1);
+poly1.thickness = 3; 
+xlabel('W');
+title('DTFT of Periodic Impulse Train')
+disp(Wo)