Re: control package, can't simulate complex systems

[Torsten Lilge]

On Wed, 2020-06-10 at 11:37 -0700, Thomas D. Dean wrote:
> On 2020-06-10 11:26, Nicholas Jankowski wrote:
> > On Wed, Jun 10, 2020 at 12:40 PM Doug Stewart <doug.dastew@gmail.com
> >  
> > <mailto:doug.dastew@gmail.com>> wrote:
> > 
> >     try
> >     step(ss(q))
> > 
> > 
> > well that seemed to do the trick.  step(ss(q)) plots quickly in
> > Octave, 
> > and it matches the output produced in Matlab by  step(q) and
> > step(ss(q))
> > 
> > so, thoughts on why octave needs it converted into state-space 
> > representation to avoid choking on it but Matlab doesn't?
> > 
> > 
> I get an error with this.
> 
> q = tf(...)
> 
> error: '__lti_input_idx__' undefined near line 211, column 211
> error: called from
>      tf at line 211 column 31
> 

This typically looks as if the control package was not installed with
the currently running octave version.

Torsten