Pole-Zero Plot of Transfer Fucntion H(z)

I can't to find poles and zeroes of given function

I try to write H(z) as below, but i'm getting error anyone know how can i write this function and find the zeros and poles like this:

syms z;
summ = 1;
c = [0 0 0 0];
h1 = [0 0 0 0];
for k = 1:4
    c(k) = 0.95*exp((0.15*pi+0.02*pi*k)*1j);
    h1 = ((conj(c(k))-exp(1j.*w).^-1).*(c(k)-exp(1j.*w).^-1))/((1-c(k).*exp(1j.*w).^-1).*(1-conj(c(k)).*exp(1j.*w).^-1));
    summ = summ*h1;
end
h(z) = h1*h2(z);
pzmap(h);

Answer 1

[Kiran Felix Robert]

Hi Bahare,

To use pzmap, the input argument must be one of the Dynamic System Model as mentioned in the 'pzmap' documentation.

You may also try using Poles, which might accept symbolic input arguments.