bugGNU Octave - Bugs: bug #46325, Error with rlocus plot

 
 

bug #46325: Error with rlocus plot

Submitted by:  None
Submitted on:  Thu 29 Oct 2015 05:08:55 PM UTC  
 
Category: PlottingSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: Need InfoAssigned to: None
Originator Name: Avirup KunduOriginator Email: -unavailable-
Open/Closed: OpenRelease: 4.0.0
Operating System: GNU/Linux

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Sun 01 Nov 2015 02:51:35 PM UTC, comment #5:

Re-posting comments which are present in e-mail, but not in Savannah's bug tracker.

Sorry, I don't know why the description didn't save. Here it is:

I used the command

The root locus which is supposed to go off to infinity does not go off to infinity and is terminated. This seems to be the problem with all plots going off to infinity.

Upon clicking the autoscale button, the plot vanishes, only the dotted line representing asymptotes remain.

If I use

and click autofocus, the entire plot disappears only the legend remains.

Also the coloured dots used to mark the poles and zeros are not visible. Can anything be done to solve that?

I get it that higher roots are difficult to handle. But if the graph itself disappears on clicking the Autoscale button, that is a rendering bug right? Attaching screenshots, if that helps.

Rik <rik5>
Project Administrator
Sun 01 Nov 2015 11:46:22 AM UTC, comment #4:

I have no idea why I can't post the description. It's not saving the text. It's available on the email, but it's not displaying here.


I get it that higher roots are difficult to handle. But if the graph itself disappears on clicking the Autoscale button, that is a rendering bug right?
Attaching screenshots, if that helps.

Thanks for the tip Doug. Any idea on how I can change the size and characters used to plot the poles and zeros? That would be really helpful.

Avirup Kundu <avirup>
Sun 01 Nov 2015 11:40:04 AM UTC, comment #3:

Sorry, I don't know why the description didn't save. Here it is:

Avirup Kundu <avirup>
Fri 30 Oct 2015 05:03:47 PM UTC, comment #2:

The problem is that you have a triple root at -2.
Higher order roots are always hard to handle.
You can override the default k by telling it what k you want
[RLDATA, K] = rlocus (SYS, INCREMENT, MIN_K, MAX_K)
I don't think that this is a bug.

Doug Stewart <dastew>
Fri 30 Oct 2015 04:53:34 PM UTC, comment #1:

There was no description attached to this report.

Rik <rik5>
Project Administrator
Thu 29 Oct 2015 05:08:55 PM UTC, original submission:
Anonymous

 

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

Attach File(s):
   
   
Comment:
   

Attached Files
file #35355:  After Autoscale.png added by avirup (18KiB - image/png)
file #35354:  Before Autoscale.png added by avirup (26KiB - image/png)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by paramaniac
  • -unavailable- added by avirup (Updated the item)
  • -unavailable- added by dastew (Posted a comment)
  • -unavailable- added by rik5 (Posted a comment)
  • -unavailable- added by None (Submitted the item)
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    Follow 4 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 01 Nov 2015 05:25:15 PM UTCparamaniacCarbon-Copy-=>Added paramaniac
    Sun 01 Nov 2015 11:40:04 AM UTCavirupAttached File-=>Added After Autoscale.png, #35355
    Sun 01 Nov 2015 11:40:03 AM UTCavirupAttached File-=>Added Before Autoscale.png, #35354
    Fri 30 Oct 2015 04:53:34 PM UTCrik5StatusNone=>Need Info

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