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+//Example 8.15
+//Obtain the DFT of x[n]=(a^n).u[n]
+clc;
+a=0.5;
+for i=0:1:7
+    x(i+1)=a.^i;
+end
+X=fft(x,-1);
+disp(X,'X[k]=');
+\ No newline at end of file