draw eigenvalues of matrix in z-plane

hi how i can calculate and plot eigenvalues of state space matrix -A- in z-plane?

thanks

[John D'Errico]

Please don't post the same question multiple times. I've deleted the replicate one you posted.

[John D'Errico]

As far as an answer goes, what have you tried?

help eig
help imag
help real
help plot

Make an effort.