Plot transfer function with exponential function

Hi, how can I plot this tf in Matlab:

G(s)= 4e^-s/(s^2+4s+4)

I have tried this, but I am not sure if this is ok:

sys = tf([4*exp(-1)],[1 4 4]);

Answer 1

[Ameer Hamza]

An alternative approach:

s = tf('s');
G = 4*exp(-s)/(s^2+4*s+4);
step(G)

[Mark S]

Thanks

Answer 2

[Setsuna Yuuki.]

You need add inputdelay

sets=tf(4,[1 4 4],'inputdelay',1) 
sets =

                   4
  exp(-1*s) * -------------
              s^2 + 4 s + 4

[Mark S]

Thanks