% D i matlab
% diff(y)
% help dif

s = tf('s')
C=-10;
G1 = (0.3*C) / (s^2 + 1.5*s+0.3*C);

[y, t] = step(G1);
plot(t, y);
figure;
[y, t] = impulse(G1);
plot(t,y);