Re: Request for Matlab output

[NJank]

Lukas Reichlin-4 wrote
> Dear Octave community,
> 
> In order to improve error handling in the control package, I would like to
> know what Matlab’s output/error message looks like for each of the
> following three lines of code:
> 
> dss (1, 2, 3, 4, 0)
> 
> feedback (tf (1), tf (-1))
> 
> feedback (ss (1), ss (-1))
> 
> Could someone with access to Matlab and its Control System Toolbox please
> send me the resulting text output?
> 
> Thanks in advance,
> Lukas

see below. Matlab 2015a.  note that the error and warning were printed in a
very pretty red and orange.

>> dss (1, 2, 3, 4, 0)

ans =
 
  a = 
       x1
   x1   1
 
  b = 
       u1
   x1   2
 
  c = 
       x1
   y1   3
 
  d = 
       u1
   y1   4
 
  e = 
       x1
   x1   0
 
Continuous-time state-space model.

>> feedback (tf (1), tf (-1))
Error using InputOutputModel/feedback (line 137)
Feedback interconnection has infinite gain at all frequencies due to
singular algebraic loops.
 
>> feedback (ss (1), ss (-1))
Warning: The closed-loop model may be improper because of singular algebraic
loops. 
> In InputOutputModel/feedback (line 134) 

ans =
 
  d = 
        u1
   y1  NaN
 
Static gain.



--
View this message in context: 
http://octave.1599824.n4.nabble.com/Request-for-Matlab-output-tp4673198p4673200.html
Sent from the Octave - Maintainers mailing list archive at Nabble.com.