how to plot step response from an unknown first order system?

im having trouble with plotting the step response beacause my system doesnt reach the steady state. i need help to increase the ouput till it reaches the steady state

[John BG]

have you checked stability?

Answer 1

[Azzi Abdelmalek]

Unknown first order system should have an unknown step response. If your system is stable, you normally can see the steady state.

%Example
N=1;
D=[1 10]
h=tf(N,D);
step(h)

you can check the stability:

r=roots(D)

the real part of r should be negative