%% Singular Value Plot with Specified Line Attributes
% Specify the line style, color, or marker for each system in a sigma plot using the LineSpec input argument.

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

% The first LineSpec, 'r', specifies a solid red line for the response of H. The second LineSpec, 'b--', specifies a dashed blue line for the response of Hd.
% Copyright 2021 The MathWorks, Inc.