symbolic z transform answer to transfer function

Is there a way to convert the symbolic answer of ztrans() to a transfer function tf()?

right now I am using

syms n z 
x2_n = (1+n+n^2)
ztrans(x2_n)

I need to get the answer into a transfer function. Is there a way to do this?

Thanks!

Answer 1

[Azzi Abdelmalek]

syms n z   
x2_n = (1+n+n^2);
m=ztrans(x2_n);
h=collect(m);
[ii,jj]=numden(h);
num=sym2poly(ii);
den=sym2poly(jj);
ts=1 % Sample time
model=tf(num,den,ts)