bugGNU Octave - Bugs: bug #62373, some plot functions ignore axes...


bug #62373: some plot functions ignore axes handle (interaction with newplot)

Submitter:  Markus Mützel <mmuetzel>
Submitted:  Wed 27 Apr 2022 06:02:13 PM UTC
Category:  Octave Function Severity:  4 - Important
Priority:  7 - High Item Group:  Regression
Status:  Confirmed Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Sat 30 Apr 2022 03:44:43 PM UTC, comment #2: 

Slightly modified test code which is easier to see that both plots end up in the same axes is

H1 = subplot(2,1,1);
H2 = subplot(2,1,2);
stairs(H1, 1:5,1:5, 'b')
stairs(H2, 1:5,5:-1:1, 'r')

Script is attached as tst_stairs.m

(file #53166)

Rik <rik5>
Project Administrator
Sat 30 Apr 2022 03:40:06 PM UTC, comment #1: 

This is complicated behavior at the heart of plotting in Octave.  I agree that my preferred course of action would be to revert the changeset on newplot.  I did that here http://hg.savannah.gnu.org/hgweb/octave/rev/7d5cb3dd312d.

I re-opened the other bug report (bug #61945) and made it a dependency of this bug report.

Rik <rik5>
Project Administrator
Wed 27 Apr 2022 06:02:13 PM UTC, original submission:  

Re-creating a bug report for the issue reported in patch #10200 so that it can be marked as a blocker for Octave 7.2.

The original report:
stairs ignores first arg: axes handle

H1 = subplot(2,1,1);
H2 = subplot(2,1,2);
stairs(H1, 1:5,1:5, 'b')
stairs(H2, 1:5,1:5, 'r')

both draw commands goes into last axes handle
This does not happen with plot(H, ...)

Addendum: This is a regression from bug #61945 for which `newplot` was changed to no longer set the current axes. (I pushed those changes probably a little to hastily.)
This does not only happen for `stairs` but for all plot functions that expect `newplot` to change the current axes. That is most probably true for functions that combine `newplot` with `__next_line_color__.m` and `__next_line_style__.m` (because the latter always act on the current axes).

Functions that combine those functions and might therefore be affected are:
- area.m
- plot3.m
- stairs.m
- bar.m
- stem.m

To be save, we should probably check all functions that use `newplot` (which are many)...

Should we revert the changes for bug #61945 and work out a proper fix for this before reapplying them on default?

Markus Mützel <mmuetzel>
Project Member


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file #53166:  tst_stairs.m added by rik5 (95B - text/x-matlab)


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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-04-30 rik5 Attached File- Added tst_stairs.m, #53166
        Severity5 - Blocker 4 - Important
        Summarysome plot functions ignore axes handle some plot functions ignore axes handle (interaction with newplot)
    2022-04-30 rik5 Release7.1.0 dev
    2022-04-30 rik5 Dependencies- bugs #61945 is dependent
    2022-04-27 mmuetzel Priority5 - Normal 7 - High
    2022-04-27 mmuetzel Dependencies- patch #10200 is dependent

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