MATLAB Answers


Undefined function 'tf' for input arguments of type 'char'?

Asked by Lenin
on 1 May 2013

Hey everyone,

I am running R2012b.

I type in: s = tf('s')

Undefined function 'tf' for input arguments of type 'char'.

can someone please help me?

Thanks so much!

  1 Comment

Kye Taylor
on 1 May 2013

What do you want to do with tf('s')... transfer function? What does tf represent?

2 Answers

Answer by Arkadiy Turevskiy
on 1 May 2013

tf is part of Control System Toolbox. The error message you are seeing means you do not have this product on your license. You can see which toolboxes you have by typing


at the command line.

  1 Comment

Walter Roberson
on 1 May 2013

The Control Systems Toolbox is included with the Student Version license, but is not installed by default.

Answer by Jan Simon
on 1 May 2013

Asking Google or searching in the forum is a good strategy to get fast answers. See


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