bugGNU Octave - Bugs: bug #61099, (xyz)limmode behavior different...


bug #61099: (xyz)limmode behavior different from Matlab when one is axis "auto" and another "manual"

Submitted by:  None
Submitted on:  Wed 01 Sep 2021 06:34:14 AM UTC  
Category:  Plotting Severity:  2 - Minor
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Confirmed Assigned to:  None
Originator Name:  Bernhard Schweighofer Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  dev
Operating System:  Any

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Thu 02 Sep 2021 09:17:02 PM UTC, comment #2: 

Changing the Item Group to "Matlab Compatibility" and updating the Summary to be more specific about the difference between Octave and Matlab.

Also, just to be thorough, this behavior applies to whichever axis is "auto".  For example, this code restricts the x-axis based on the settings of the y-axis

plot (1:100)
xlim ([1, 50])
ylim ([1, 10])
xlim auto

Rik <rik5>
Project Administrator
Wed 01 Sep 2021 04:08:16 PM UTC, comment #1: 

confirming the same behavior on Windows, v6.3.0. attached image showing side-by-side of octave and matlab 2021a figures after the commands:

plot (1:100)
set (gca, 'ylim', [0 1000])
set (gca, 'xlim', [1 10])
set (gca, 'ylimmode', 'auto')
set (gca, 'xlim', [1 11])

Nicholas Jankowski <nrjank>
Project Member
Wed 01 Sep 2021 06:34:14 AM UTC, original submission:  


given following example:

plot (1:100)
set (gca, 'ylim', [0 1000]) % just some 'dummy' out-of-range setting
set (gca, 'xlim', [1 10])
disp ('press ENTER to continue')
set (gca, 'ylimmode', 'auto')
set (gca, 'xlim', [1 11])

The expected behavior should be (as in eg. Matlab R2016b) that (in the end) the y-axis is scaled to a range of 1 to 11. But octave scales from 0 to 100 - octave uses the complete data range to scale instead of only the data shown in the current view (limited x-range).

PS. Tested with octave 6.3.0 under linux with graphics_toolkit qt, fltk and gnuplot.



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  • -email is unavailable- added by rik5 (Posted a comment)
  • -email is unavailable- added by nrjank (Updated the item)
  • -email is unavailable- added by None (Submitted the item)

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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-09-02 rik5 Severity3 - Normal => 2 - Minor
        Item GroupIncorrect Result => Matlab Compatibility
        Release6.3.0 => dev
        Summary(xyz)limmode doesn't work as expected => (xyz)limmode behavior different from Matlab when one is axis "auto" and another "manual"
    2021-09-01 nrjank Attached File- => Added ylimmode_auto_comparison.png, #51859
        StatusNone => Confirmed
        Operating SystemGNU/Linux => Any

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