Re: issue running an example from control package

[Lukas Reichlin]

On 08.10.2013, at 02:36, Gustavo Marcano <address@hidden> wrote:

> How do you do?, 
> 
> I'm sorry for the question, but I'm new at this, just wanted to know why do i 
> get an  error when running this command on octave  (I'm using ubuntu):
> 
> "octave:1> s = tf ('s');"
> 
> after pressing enter I get:
> 
> "error: Invalid call to tf.  Correct usage is:
> 
>  -- Function File:  tf (NUM, DEN, TSAM, INNAME, OUTNAME)
> 
> 
> Additional help for built-in functions and operators is
> available in the on-line version of the manual.  Use the command
> `doc <topic>' to search the manual index."
> 
> 
> I'm aware that "tf" function requires (and says so on the error message too) 
> that the correct format is  tf (NUM, DEN, TSAM, ...., but how in this page 
> http://octave.sourceforge.net/control/function/tf.html the examples runs just 
> fine. 
> 
> 
> 
> Thanks in advance
> 

Hi Gustavo

It looks like you're using a very outdated version of the control package, 
control-1.0.11, together with Octave 3.2.x. To get s = tf ('s') working, you 
need the current Octave 3.6.x and control-2.4.4.

Hope this helps,
Lukas