How to get the settling time of the plot

here I have state space model

A =[0  1;-30 -1.2]
B =[0;30]
C=[1 0];
G=ss(A,B,C,[]);
t = [0:0.001:5]';
[y, t, x] = step(G,t)
plot(t, x(:,1))

now how can i get settling time and rise time of this plot?

Answer 1

[Mathieu NOE]

hello

with stepinfo, you have access to all the info's :

A =[0  1;-30 -1.2];
B =[0;30];
C=[1 0];
G=ss(A,B,C,[]);
stepinfo(G)

ans = 

  struct with fields:

        RiseTime: 0.207388987205853
    SettlingTime: 6.429183012079071
     SettlingMin: 0.500017169365977
     SettlingMax: 1.707223152671701
       Overshoot: 70.722315267170117
      Undershoot: 0
            Peak: 1.707223152671701

[RJS]

This is the stepinfo of 1st state if I want the step info of 2nd state then again i have to change the C matrix but i don't want to change the C matrix .

The state-space model which I have given above is just an example actually my system has 10 state's so to extract each state's plot I am using

t = [0:0.001:5]';

[y, t, x] = step(G,t)

plot(t, x(:,1))

plot(t, x(:,2))

and I want stepinfo of each state

[Star Strider]

No substantive changes are necessary. Define ‘C’ as an appropriately-sized eye matrix instead of a vector, and stepinfo produces the information for both states —

A =[0  1;-30 -1.2];
B =[0;30];
% C=[1 0];
C = eye(2);
G=ss(A,B,C,[]);
Si = stepinfo(G);

First_State = Si(1)

First_State = struct with fields:
         RiseTime: 0.2074
    TransientTime: 6.4292
     SettlingTime: 6.4292
      SettlingMin: 0.5000
      SettlingMax: 1.7072
        Overshoot: 70.7223
       Undershoot: 0
             Peak: 1.7072
         PeakTime: 0.5736

Second_State = Si(2)

Second_State = struct with fields:
         RiseTime: 0
    TransientTime: 6.6977
     SettlingTime: NaN
      SettlingMin: -3.2871
      SettlingMax: 4.6391
        Overshoot: Inf
       Undershoot: Inf
             Peak: 4.6391
         PeakTime: 0.2868

After tthat, just reference the appropriate fields of ‘Si’ (in this example). MATLAB makes this easy!

.

[RJS]

thank you @Star Strider, but If my actual C matrix is like this C = [1 1] then, this is solution is not valid

So how to do this one

[Star Strider]

If ‘C=[1 1]’ it may not be possible.

[RJS]

okay ,thanks for your response