[Octave-bug-tracker] [bug #51844] [control package] Plotting system responses doesn't work anymore

[Alexander Wilms]

URL:
  <http://savannah.gnu.org/bugs/?51844>

                 Summary: [control package] Plotting system responses doesn't
work anymore
                 Project: GNU Octave
            Submitted by: alexanderw
            Submitted on: Fri 25 Aug 2017 11:53:51 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Output of development version:


>> s = tf('s')

Transfer function 's' from input 'u1' to output ...

 y1:  s

Continuous-time model.
>> g = 1/(1+s)

Transfer function 'g' from input 'u1' to output ...

        1
 y1:  -----
      s + 1

Continuous-time model.
>> step(g)
error: tf2ss: __sl_td04ad__: TD04AD returned info = 0
error: called from
    __sys2ss__>__proper_tf2ss__ at line 121 column 12
    __sys2ss__ at line 69 column 14
    ss at line 181 column 16
    __c2d__ at line 70 column 13
    c2d at line 82 column 7
    __time_response__ at line 116 column 7
    step at line 74 column 10
>> impulse(g)
error: tf2ss: __sl_td04ad__: TD04AD returned info = 0
error: called from
    __sys2ss__>__proper_tf2ss__ at line 121 column 12
    __sys2ss__ at line 69 column 14
    ss at line 181 column 16
    __c2d__ at line 70 column 13
    c2d at line 82 column 7
    __time_response__ at line 116 column 7
    impulse at line 74 column 10


Output of version 4.2.1:


>> s = tf('s')

Transfer function 's' from input 'u1' to output ...

 y1:  s

Continuous-time model.
>> g = 1/(1+s)

Transfer function 'g' from input 'u1' to output ...

        1
 y1:  -----
      s + 1

Continuous-time model.
>> step(g)
>> impulse(g)


In version 4.2.1, the two plots are shown, in the development version that's
not the case.




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