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+//Example 2.4
+//MAXIMA SCILAB TOOLBOX REQUIRED FOR THIS PROGRAM
+//Z- transform of a^n u(n) 
+clear;
+clc ;
+close ;
+syms a n z;
+x =a^n
+X= symsum (x*(z^(-n)),n ,0, %inf );
+//Display the result in command window
+disp (X,"Z-transform of a^n u(n) with is:");
+disp('ROC is the Region mod(z) > a')
+\ No newline at end of file