I am using pzmap where poles and zeros are ploted but my question how can i see poles on unit circle only not zeros?

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Muhammad on 22 Oct 2018
Commented: Muhammad on 23 Oct 2018
I am using frequency response analysis and i want to plot the poles of the transfer function on unit circle without ploting zeros. Can anyone help me how can i do that?

Accepted Answer

Erivelton Gualter
Erivelton Gualter on 22 Oct 2018
You can extract the pole and zeros and construct your model again using zpk for example.
Check the following example:
s = tf('s');
G = (s+0.5)/(s^2+s-0.5);
[P, Z] = pzmap(G);
G_without_zeros = zpk(P,[],1);
subplot(211); zplane(Z,P); title('Ploting Poles and Zeros on Unit Circle');
subplot(212); zplane(Z,[]); title('Ploting only Zeros on Unit Circle');

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