close all
clc;
g1=tf(10,[1 7 14 8]);
T1=feedback(g1,1);figure(1);
step(T1),hold on

T2=feedback(2.5*g1,1)
step(T2), legend('T1','T2')

figure(3);
rlocus(g1)

gc1=tf([1 .1],[1 .04]);
gc2=tf([1 .25],[1 .1]);
gc3=tf([1 1],[1 0.4]);

Tc1=feedback(gc1*g1,1)
Tc2=feedback(gc2*g1,1)
Tc3=feedback(gc3*g1,1)

figure(4), rlocus(gc1*g1), hold on
rlocus(gc2*g1)
rlocus(gc3*g1)
legend('gc1','gc2','gc3')

figure(5), step(T1), hold on
step(Tc1)
step(Tc2)
step(Tc3); legend('T1','Tc1','Tc2','Tc3')