% Nise, N.S.
% Control Systems Engineering, 6th ed.
% John Wiley & Sons, Hoboken, NJ, 07030
% Control Systems Engineering Toolbox Version 6.0
% Copyright 2011 by John Wiley & Sons, Inc.
% TryIt 10.3
% Use MATLAB, the Control System Toolbox, and the
% following statements to find the gain and phase
% margins of G(s)H(s)=100/[(s+2)(s+4)(s+6)] using the
% Nyquist diagram.
% After the Nyquist diagram appears:
% 1. Right-click in the graph area.
% 2. Select Characteristics.
% 3. Select All Stability Margins.
% 4. Let the mouse rest on the margin points
% to read the gain and phase margins.