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+//Example 3.32

+//Program to plot the result of the given sequence

+//X[k]=[1,2,2,1,0,2,1,2]

+//y[n]=x[n/2] for n=even,0 for n=odd 

+clear;

+clc ;

+close ;

+X=[1,2,2,1,0,2,1,2];

+x = fft (X , 1);

+y=[x(1),0,x(2),0,x(3),0,x(4),0,x(5),0,x(6),0,x(7),0,x(8),0];

+Y = fft (y , -1);

+//Display sequence Y[k] and in command window

+disp(Y,"Y[k]=");

+//Plotting the sequence Y[k]

+k=0:1:15;

+a = gca ();

+a.y_location ="origin";

+a.x_location ="origin";

+plot2d3(k,Y,2);

+poly1=a.children(1).children (1);

+poly1.thickness=2;

+xtitle('Plot of Y(k)','k','Y(k)');
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