how to get the frequency from Pole-zero map?

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?

[Oskar Adolfson]

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

[Sergio Cypress]

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

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

Answer 1

[Star Strider]

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.