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+//Scilab Code for Example 2.38(i) of Signals and systems by

+//P.Ramakrishna Rao

+//Inverse Z Transform:ROC |z|>2

+clear;

+clc;

+z = %z;

+syms n z1;

+//To find out Inverse z transform z must be linear z = z1

+X  =z^2/(z^2+3*z+2);

+X1 = denom(X);

+zp = roots(X1)

+X1 = z1^2/(z1^2+3*z1+2);

+F1 = X1*(z1^(n-1))*(z1-zp(1));

+F2 = X1*(z1^(n-1))*(z1-zp(2));

+h1 = limit(F1,z1,zp(1));

+disp(h1*'u(n)','h1[n]=')

+h2 = limit(F2,z1,zp(2));

+disp((h2)*'u(n)','h2[n]=');

+disp((h1)*'u(n)'+(h2)*'u(n)','h[n]=');

+////Result

+//  h[n]= (2(- 2)^n+1 - (- 1)^n)*u(n)