MATLAB: Controllable and observable canonical form

Question

Hi, I want to convert a transfer function to controllable and observable canonical form. Tried with tf2ss but it did not work. I am sharing a part of my code. Is there any way to get those A,B,C,D matrices by any Matlab functions??

My code:

clc; clear all;

Den=[0 1 1]; Num=[1 5 6];

s=tf(Den,Num)

[A B C D]=tf2ss(s)

Answer 1

The tf2ss function wants a transfer function as input, not a system object.

Try this:

[A B C D]=tf2ss(Den,Num)
A =
    -5    -6
     1     0
B =
     1
     0
C =
     1     1
D =
     0

EDIT —

To get the state space representation from a system object, just use the ss funciton:

[A B C D] = ss(s);