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## step response of a state space system

 From: Beginner1 Subject: step response of a state space system Date: Tue, 9 Jan 2018 04:27:06 -0700 (MST)

```Hi!
I am a very beginner in Octave. I need your help in the following task:
I need to obtain and plot the step response of a system whose state-space
matrices are known and it can be represented by

xdot=A*x+B*u
y=C*x+D*u

For this purpose, I have written this code:

/%State-space system parameters
w=314.159;
ki=1.5;
kp=5000;
A=[0 1 0 0 0 0; 0 0 1 0 0 0; 0 -4*w^2 0 0 0 0;0 0 0 0 1 0;0 0 0 0 0 1;0 0 0
0 -4*w^2 0];
B=[0 0 0 0 0 0; 0 0 0 0 0 0;0 0 -1 0 1 0;0 0 0 0 0 0;0 0 0 0 0 0;0 0 0 -1 0
1];
C=[2*(w^2)*ki  0  ki  0  ki*w  0;0 ki*w 0 2*(w^2)*ki 0 ki];
D=[1 0 -kp 0 kp 0;0 1 0 -kp 0 kp];

%Perform system simulation

stname = {'xd1', 'xd2', 'xd3','xq1','xq2','xq3'};
sys = ss (A, B,C,D,'stname', stname)
t=linspace(0,3,1000)
[y,t,x]=step(sys)
plot(t,y)
/

However, an error message is obtained at the console for the command
plot(t,y) saying that the dimensions of one of the plot arrays are not
correct.

Any suggestion?

Thanks

--
Sent from: http://octave.1599824.n4.nabble.com/Octave-General-f1599825.html

```

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