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+//Example 14.1
+//EFFECT OF DFT LENGTH ON SPECTRAL ANALYSIS
+clear;
+clc;
+N=16;
+n=0:N-1;
+f1=0.22;
+f2=0.34;
+
+R = input("R point DFT(R E [16,128]) = ");        //Input f1 = 64
+if R >= N 
+    x=0.5*(sin(2*%pi*f1*n')) + sin(sin(2*%pi*f2*n'));
+    x=[x',zeros(1,R-length(n))];
+    disp(x,'the sequence is :');
+    for n=0:R-1
+        for k=0:R-1
+            W(n+1,k+1) = exp(-(%i*2*%pi*k/R)*n);
+        end
+    end
+    X = W*x';
+    disp(X,'DFT is, X = ')
+else
+    disp('invalid computation');
+end
+m=0:R-1;
+clf();
+figure(0)
+a = gca();
+plot2d3(m,abs(X),2) //  plotting DFT of sequence
+plot(m,abs(X),'r.')
+a.x_location = 'origin';
+a.y_location = 'origin';
+poly1 = a . children (1) . children (1) ;
+poly1.thickness = 2.5;
+xtitle('original sequence','n','x[n]');