bugGNU Octave - Bugs: bug #37622, rlocus doing wrong root locus if...

 
 

bug #37622: rlocus doing wrong root locus if there are 4 arguments in function

Submitted by:  None
Submitted on:  Wed 24 Oct 2012 02:24:34 AM UTC  
 
Category: Plotting with gnuplotSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Inaccurate Result
Status: Octave ForgeAssigned to: None
Originator Name: sergio_br2Originator Email: -unavailable-
Open/Closed: ClosedRelease: 3.6.3
Operating System: GNU/Linux

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Thu 25 Oct 2012 07:26:03 PM UTC, comment #4:

Hi Sérgio

Thanks for your useful report. I couldn't locate the bug until now. Well, at least it works with one argument :-)

Regards,
Lukas

Lukas Reichlin <paramaniac>
Thu 25 Oct 2012 01:43:32 PM UTC, comment #3:

I used the wrong OF address, fixed now.

If you want to subscribe to that list, please see this:

https://lists.sourceforge.net/lists/listinfo/octave-dev

Jordi Gutiérrez Hermoso <jordigh>
Project Administrator
Thu 25 Oct 2012 02:44:46 AM UTC, comment #2:

How can I follow up there? I don't understand about mailing lists...

Anonymous
Wed 24 Oct 2012 03:47:48 PM UTC, comment #1:

This looks like a problem with an Octave Forge package, not a bug
in Octave. The correct place to report this problem is the
Octave Forge mailing list, octave-dev@lists.sourceforge.net.

A copy of this update to the bug report is being sent to that
list so that they are aware of it. Please follow up there.

Jordi Gutiérrez Hermoso <jordigh>
Project Administrator
Wed 24 Oct 2012 02:24:34 AM UTC, original submission:

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

Anonymous

 

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Attach File(s):
   
   
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Attached Files
file #26820:  right_rootlocus.svg added by None (20KiB - image/svg+xml)
file #26821:  wrong_rootlocus_increment_0.1.svg added by None (48KiB - image/svg+xml)
file #26822:  wrong_rootlocus_increment_0.001.svg added by None (69KiB - image/svg+xml)
file #26823:  rlocus_with_problem.m added by None (239B - text/x-objcsrc)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by paramaniac (Posted a comment)
  • -unavailable- added by jordigh
  • -unavailable- added by jordigh (Posted a comment)
  • -unavailable- added by None (Submitted the item)
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    Follow 9 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Thu 25 Oct 2012 01:43:32 PM UTCjordighCarbon-Copy-=>Added -unavailable-
    Thu 25 Oct 2012 01:42:30 PM UTCjordighCarbon-CopyRemoved -unavailable-=>-
    Wed 24 Oct 2012 03:48:52 PM UTCjordighStatusNone=>Octave Forge
    Wed 24 Oct 2012 03:47:48 PM UTCjordighOpen/ClosedOpen=>Closed
      Carbon-Copy-=>Added -unavailable-
    Wed 24 Oct 2012 02:24:34 AM UTCNoneAttached File-=>Added right_rootlocus.svg, #26820
      Attached File-=>Added wrong_rootlocus_increment_0.1.svg, #26821
      Attached File-=>Added wrong_rootlocus_increment_0.001.svg, #26822
      Attached File-=>Added rlocus_with_problem.m, #26823

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