%% Compare Singular Value Plots of Several Dynamic Systems
% Compare the frequency response of a continuous-time system to an equivalent discretized system on the same singular value plot.
% Create continuous-time and discrete-time dynamic systems.

H = tf([1 0.1 7.5],[1 0.12 9 0 0]);
Hd = c2d(H,0.5,'zoh');

% Create a plot that displays both systems.

sigma(H,Hd)

% The sigma plot of a discrete-time system includes a vertical line marking the Nyquist frequency of the system.
% Copyright 2021 The MathWorks, Inc.