% Fig. 6.21   Feedback Control of Dynamic Systems, 6e 
%             Franklin, Powell, Emami
%

clear all;
%close all;
clf

num=1;
den=[1 2 1];
rlocus(num,den);
axis([-3 1 -2 2])
grid;
title('Fig. 6.21: Root locus of G(s)=1/(s+2)^2 vs K');

