clear all
clc

num = [1]
denom = [1 0]

Gp = tf (num, denom)
H = [1/3]

M = feedback( Gp, H)
step(M)
hold on

Kp=10
Ki=0
Kd=0

Gc = pid( Kp, Ki, Kd)

Mc = feedback( Gc*Gp, H)
step(Mc)
grid on