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 2018-10-22

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评论： Muhammad 2018-10-23

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?

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Erivelton Gualter 2018-10-22

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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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Walter Roberson 2018-10-22

In R2014b and later, if you "hold on" then the xlim and ylim should be preserved. In R2014a and earlier, you needed to "hold all" to have the limits preserved.

Muhammad 2018-10-23