Pole Zero plot formation iin MATLAB

I am having a transfer function H(z)

    H(z) =(0.44z^-1 + 0.362z^-2 + 0.02z^-1)/(1 + 0.4z^-1 + 0.18z^-2 -0.2z^-3)

How can i have its pole zero map.

Answer 1

[Azzi Abdelmalek]

Ts=1, % sample time
H=tf([0 0.44 0.362 0.02],[1 0.4 0.18 -0.2],Ts,'variable','z^-1')
set(H,'variable','z')
[N,D]=tfdata(H,'v')
pole=roots(D)
zero=roots(N)