%p3-controle

%% q1:
Gs = tf([100 100], [1 110 1000 0])
bode(Gs)
grid

%% q2:
GsHs = tf([10^4], [1 70 1000]);
%b
nyquist(GsHs)
%c
N = 0;
P = 0;
Z = P - N

%% q3:
%figure q3.png

%% q4:
Gc = 10;
G = tf([2], [1 5 4 0]);
GcG = Gc*G;
H = feedback(GcG,1)
step(H)

%% p3-2015
%% q1
Gs = 100*tf([1 2], [1 20.2 4])
bode(Gs)
grid

%% q2
GsHs = 5*tf([-1 1], [1 7 10])
%b
nyquist(GsHs)

bode (GsHs)
%% q3

%% q4
Gc = 3/5;
G = tf([1 -5 6], [1 3 2]);
GcG = Gc*G;
H = feedback(GcG,1)
step(H)