EE443: USING MATLAB FOR PLOTTING ROOT LOCUS

%
% Filename: example5.m
%
% Description:  M-file demonstrating matlab functions rlocus() which
%               plots root locus and rlocfind() which allows selection
%               of points on root locus so that corresponding parameter
%               value is returned.
%

clear; clf;                         % clear memory and figures

p = [1];                            % numerator of G(s)
q = [1 3 2 0];                      % denominator of G(s)

rlocus(p,q);                        % plot root locus for CL system

title('Example 5: Sample Root Locus Plot');

rlocfind(p,q)                       % allow user to select CL pole
                                    % location, so that corresponding
                                    % controller gain is returned

Select a point in the graphics window

selected_point =

  -0.0046 + 1.4035i

ans =

    5.8914