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//Scilab Code for Example 2.40 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-0.5)*(z-1));
X1 = denom(X);
zp = roots(X1)
X1 = z1^2/((z1-0.5)*(z1-1));
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-1)'-(h2)*'u(-n-1)','h[n]=');
////Result
// h[n]= ((0.5)^n - 2)*u(-n-1)
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