how to get the frequency from Pole-zero map?

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Sergio Cypress 2017-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/355509-how-to-get-the-frequency-from-pole-zero-map

回答： Star Strider 2017-9-9

I use pzplot() function to plot the Pole-zero map(figure 1), and the legend shows the every poles' information once the narrow click the figure. And I want to storage the infrom into a variety. so could you help me how to do?

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Oskar Adolfson 2017-9-7

Isn't the frequency the imaginary part of the poles?

Sergio Cypress 2017-9-9

在 MATLAB Online 中打开

I want get the values into a variety,like that:

handle = pzplot(data)
frequences = handle.frequence()

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Answer 1

Star Strider 2017-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/355509-how-to-get-the-frequency-from-pole-zero-map#answer_280908

在 MATLAB Online 中打开

The resonant frequencies (poles) are given by the absolute value of the poles of the continuous system.

Example —

H = tf([1 -1],[1 1 0.3],0.1);           % Discrete System
pzmap(H)
grid on
axis equal
Hc = d2c(H);                            % Convert To Continuous
fr = abs(pole(Hc));                     % Resonant Frequencies