[Octave-bug-tracker] [bug #37622] rlocus doing wrong root locus if there are 4 arguments in function

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?37622>

                 Summary: rlocus doing wrong root locus if there are 4
arguments in function
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Qua 24 Out 2012 02:24:34 UTC
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: sergio_br2
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.3
        Operating System: GNU/Linux

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Details:

Hello

I'm trying to plot a root locus graph, but depending on what I do, I get a
line that is not part of the root locus. This line appears only if I put more
than one argument in the function rlocus, if I use only one argument graph is
OK. See the script-file to reproduce this issue:


G = tf([1 1],[1 12 20 0 0])

rlocus (G)
print -dsvg right_rootlocus.svg

figure (2)
rlocus (G, 0.001, 0, 96)
print -dsvg wrong_rootlocus_increment_0.001.svg

figure (3)
rlocus (G, 0.1, 0, 96)
print -dsvg wrong_rootlocus_increment_0.1.svg


I'm using Gnu Octave 3.6.3, control toolbox 2.4.0 and gnuplot 4.6.1 on Ubuntu
12.04.

GNU Octave Version 3.6.3
GNU Octave License: GNU General Public License
Operating System: Linux 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09
UTC 2012 x86_64

control *|   2.4.0 | /usr/share/octave/packages/control-2.4.0

gnuplot 4.6 patchlevel 1

Linux sergio2-Infoway 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux



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File Attachments:


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Date: Qua 24 Out 2012 02:24:34 UTC  Name: right_rootlocus.svg  Size: 20kB  
By: None

<http://savannah.gnu.org/bugs/download.php?file_id=26820>
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Date: Qua 24 Out 2012 02:24:34 UTC  Name: wrong_rootlocus_increment_0.1.svg 
Size: 48kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=26821>
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Date: Qua 24 Out 2012 02:24:34 UTC  Name: wrong_rootlocus_increment_0.001.svg 
Size: 69kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=26822>
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Date: Qua 24 Out 2012 02:24:34 UTC  Name: rlocus_with_problem.m  Size: 239B  
By: None

<http://savannah.gnu.org/bugs/download.php?file_id=26823>

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