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+//Graphical//
+//Implementation of Equation 2.1.9 in Chapter 2
+//Digital Signal Processing by Proakis, Third Edition, PHI
+//Page 46
+clear;
+clc;
+close;
+a =1.5; 
+n =1:10;  
+x = (a)^n;
+a=gca();
+a.thickness = 2;
+plot2d3('gnn',n,x) 
+xtitle('Graphical Representation of Exponential Signal','n','x[n]');