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Re: Request for Matlab output
From: |
NJank |
Subject: |
Re: Request for Matlab output |
Date: |
Thu, 29 Oct 2015 08:46:56 -0700 (PDT) |
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.
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