time delay transfer function

[Claudiu Socaciu]

Hy is there a way to introduce in octave a time delay function.
I got for example the folowing function : H(s)= [exp(-3*s)]*(s+1)/(s^2 + 2*s +1);
I mean something like in matlab where u have the 'inputdelay' argument. 
Or any other way to simulate this transfer function in octave.

Thanks in advance.
Claudiu S.