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+//Scilab Code for Example 2.21 of Signals and systems by
+//P.Ramakrishna Rao
+//Z- transform of a^n u(n) 
+clear;
+clc ;
+close ;
+syms a n z;
+x1 =1/2;
+x2=1/3;
+X1= symsum (x1*(z^(-n)),n ,0, %inf );
+X2= symsum (x2*(z^(-n)),n ,0, %inf );
+X=X1+X2;
+//Display the result
+disp (X,"Z-transform of u(n) is:");
+disp('ROC is the Region |z|> 1/2');