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diff --git a/716/CH9/EX9.2.V/9_13_ExerciseV9_2.sce b/716/CH9/EX9.2.V/9_13_ExerciseV9_2.sce
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+//Perform 4 point DFT of x(n)=(0 -1 2 1) and sketch magnitude and phase spectrum

+clc;

+clear;

+N=4;

+xn=[0 -1 2 1];

+for k=0:1:N-1

+    Xk(k+1)=0;

+    for n=0:1:N-1

+        Xk(k+1)=Xk(k+1)+xn(n+1)*exp(-%i*2*%pi*k*n/N);

+    end

+end

+wk=0:1:N-1;

+disp(Xk,'4 point DFT of x(n)=>');

+disp(abs(Xk),'magnitude of 4 point DFT x(n)=>');

+disp(atan(imag(Xk),real(Xk)),'phase of 4 point DFT x(n)=>');

+subplot(1,2,1)

+plot2d3(wk,abs(Xk),2);

+xtitle('Magnitude Spectrum','k','|X(k)|');

+subplot(1,2,2)

+plot2d3(wk,atan(imag(Xk),real(Xk)),2);

+xtitle('Phase Spectrum','k','angle(X(k))');
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