how to obtain the parameters of the step response within matlab?

hello, I have step response in open loop of my model and I want to use Matlab to obtain the : T time constant L dead time A see figure

Answer 1

[M]

Look at the stepinfo command.

[SimTec]

I tried that and not given meaningful result and it seems it is used only when there is some oscillation before settling.

[M]

it is used only when there is some oscillation before settling.

No, try:

sys=tf([1],[1 1]);

you can check that it is a first order system (no oscillations) with:

step(sys);

and you can retrieve the data you want with:

stepinfo(sys)
ans = 

struct with fields:

        RiseTime: 2.1970
    SettlingTime: 3.9121
     SettlingMin: 0.9045
     SettlingMax: 1.0000
       Overshoot: 0
      Undershoot: 0
            Peak: 1.0000
        PeakTime: 10.5458

What other meaningful information would you want?