plotting poles and zeros of a z transform

function poleszeros

%G(z)= (4z4+5.6z3+6z2+2.4z-6.4)/(3z4+2.4z3+6.3z2-11.4z+6)

num=[4 5.6 6 2.4 -6.4];

den=[3 2.4 6.3 -11.4 6];

z=roots(num)

p=roots(den)

pzmap(p,z)

grid on;
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