ss function is undefined.

Hello,

I am trying to use the state space function, "ss" to solve four matrices. However, when I type my code in a new script file I get the following error:

*Undefined function or variable 'ss'.

Error in Homework5 (line 10) sys = ss(A,B,C,D);*

My code is shown below:

% A = [0 0 -(7/2); 1 0 -2; 0 1 -(5/2)];
B = [0; 0; (1/2)];
C = [1 0 0; 0 0 1];
D = [0; 0];
sys = ss(A,B,C,D);
step(sys)

Answer 1

[Image Analyst]

That's in the Signal Processing Toolbox. Do you see that listed when you issue the "ver" command?

[Matthew Buschur]

Yep that is the problem, I was thinking it might be a dependency issue. I couldn't remember if I slimmed the install down when I installed Matlab or not, but obviously I did.

Can one of you two direct me to the easiest way to install those two packages to my current install?

[Matthew Buschur]

Actually never mind. I got it. Thank you both!!!

Answer 2

[Star Strider]

You have to have the Control System Toolbox or the Signal Processing Toolbox (or both, at best) installed to use the ‘ss’ function.

Type:

ver

in the Command Window to see if you have one or both of them.

Answer 3

[Faisal Budikasih]

i guess the right toolbox for the function ss is control system toolbox .

[Star Strider]

Correct!