How can i plot a impulse response based on z-transfer function or difference equation

Hey guys,

i have the followeing z-transfer function:

G(z) = z^4 + 2z^3 + 3z^2 / z^4 - 1

I tried to reproduce the impuls response which can be seen in the figure. But i dont know how to do it. I tried a lot but always fail. Can anybody tell me how can i reproduce the impulse response ?

Answer 1

[Paul]

G = tf([1 2 3 0 0],[1 0 0 0 -1],-1);
impulse(G,20)

[Hamid Rezaie]

Perfect ! This is what i exactly what i was looking for *_*. Just one more question: How can i fit the y-axis for the plot of this code ?

G = tf([2 2 2 0 ],[1 0 0 1], -1);
impulse(G,10)