bugGNU Octave - Bugs: bug #60252, Strange Plot with Date and Time...

 
 

bug #60252: Strange Plot with Date and Time Axis

Submitter:  Armin Müller <arm_in>
Submitted:  Wed 17 Mar 2021 09:46:34 PM UTC
   
 
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Duplicate Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * 6.2.0 Operating System:  * Microsoft Windows
Fixed Release:  None Planned Release:  None
* Mandatory Fields

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Thu 18 Mar 2021 08:32:40 AM UTC, comment #2: 

Thank you for the two links to the related cases and for the workarounds!
I had no clue what was going on.
Strange enough that the point markers are looking correct, though.

 Armin Müller <arm_in>
Thu 18 Mar 2021 07:18:39 AM UTC, comment #1: 

Quoting Pantxo in bug #60243:

> This is the oldest known issue of opengl based graphics toolkits: bug #32980. Basically, this is a consequence of OpenGL using single precision arithmetic. See also bug #59418 about documenting the available workarounds (basically rescaling the data when it is possible, or using the gnuplot toolkit) until this gets fixed.
> Closing report as a duplicate.

 Markus Mützel <mmuetzel>
Group administrator
Wed 17 Mar 2021 09:46:34 PM UTC, original submission:  

When running the m-script in the attachment,
the plot looks strange:

  • markers are at the right position
  • line seems to be quantized horizontally to whole hours (or something else I cannot explain)
  • the axis are totally off
  • the result changes when zooming in and out



GNU Octave Version: 6.2.0 (hg id: 5cfdf97c5350)
GNU Octave License: GNU General Public License
Operating System: MINGW32_NT-6.2 Windows 6.2  x86_64

Armin Müller <arm_in>

 

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Attach Files:
   
   
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Attached Files
file #51082:  plot_time_error.m added by arm_in (579B - application/octet-stream)
file #51083:  plot_time_error.png added by arm_in (17KiB - image/png)

 

Depends on the following items
bugsOpenGL plotting backend uses single precision, not double (bug #32980, Confirmed)

Digest:
   bug dependencies.

Items that depend on this one: None found

 

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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-03-18 mmuetzel CategoryPlotting Plotting with OpenGL
        StatusNone Duplicate
        Open/ClosedOpen Closed
        Dependencies- Depends on bugs #32980
    2021-03-17 arm_in Attached File- Added plot_time_error.m, #51082
        Attached File- Added plot_time_error.png, #51083

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