How to get the damping ratio of an underdamped response

I have got a step response which seems underdamped and I have also used the 'damp' function to retrieve the values of damping ratio. But I need to find by how much it is underdamped. Please help me in finding the level of damping.

Answer 1

[Arkadiy Turevskiy]

Can you clarify your question? If you have the transfer function, damp will give you the damping factor, as you mention.

[Priya]

Thanks for your reply. I'm using a state space model and my question is how do I know by how much the system is damped.

[Arkadiy Turevskiy]

It does not matter. As long as you have a an LTI object (transfer function, state space, zpk), damp will give you a damping factor.

[Priya]

Ya, I have already tried that. Anyway thanks.