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

Submitter:  None
Submitted:  Wed 24 Oct 2012 02:24:34 AM UTC
   
 
Category:  Plotting with gnuplot Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Inaccurate Result
Status:  Octave Forge Assigned to:  None
Originator Name:  sergio_br2 Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 3.6.3
Operating System:  * GNU/Linux Fixed Release:  None
Planned Release:  None
* Mandatory Fields

Add a New Comment Rich Markup
   

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>
Group Member
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>
Group Member
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

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:
   
   
Comment:
   

Attached Files
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)
file #26821:  wrong_rootlocus_increment_0.1.svg added by None (48KiB - image/svg+xml)
file #26820:  right_rootlocus.svg added by None (20KiB - image/svg+xml)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -email is unavailable- added by paramaniac (Posted a comment)
  • -email is unavailable- added by jordigh
  • -email is unavailable- added by jordigh (Posted a comment)
  • -email is unavailable- added by None (Submitted the item)
  •  

    There are 0 votes so far. Votes easily highlight which items people would like to see resolved in priority, independently of the priority of the item set by tracker managers.

    Only group members can vote.

     

    Follow 9 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2012-10-25 jordigh Carbon-Copy- Added -email is unavailable-
    2012-10-25 jordigh Carbon-CopyRemoved -email is unavailable- -
    2012-10-24 jordigh StatusNone Octave Forge
    2012-10-24 jordigh Open/ClosedOpen Closed
        Carbon-Copy- Added -email is unavailable-
    2012-10-24 None Attached 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

    Back to the top

    Powered by Savane 3.13-758e.
    Corresponding source code