how to get the frequency from Pole-zero map?

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Sergio Cypress
Sergio Cypress 2017-9-7
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?
  2 个评论
Oskar Adolfson
Oskar Adolfson 2017-9-7
Isn't the frequency the imaginary part of the poles?
Sergio Cypress
Sergio Cypress 2017-9-9
I want get the values into a variety,like that:
handle = pzplot(data)
frequences = handle.frequence()

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回答（1 个）

Star Strider
Star Strider 2017-9-9
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
I know of no other way to do what you want.

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