bugGNU Octave - Bugs: bug #53838, variable editor displays out of...


bug #53838: variable editor displays out of bounds error too frequently

Submitted by:  Marshall <marsian>
Submitted on:  Fri 04 May 2018 09:48:39 PM UTC  
Category:  GUI Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Feature Request
Status:  None Assigned to:  None
Originator Name:  Marsian Open/Closed:  Open
Release:  4.4.0 Operating System:  Microsoft Windows

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Mon 07 May 2018 05:58:54 PM UTC, comment #3:

I've tried your examples here. There are certainly some issues, but I don't see any type of "out of bound" error. I'm seeing:

Example 1: No errors visibly detected.

Example 2: This one I can repeat. I've included a screen shot of the end result (see example_2_screen_1_Screenshot_from_2018-05-07_12-31-06.png).

Out of curiosity, I wondered about the displayed "Variable a.b(2).e not found" in the Variable Editor, whether that would be the thing that is causing this, so I deleted that window and the message went away. See the second attached screen shot (example_2_screen_2_Screenshot_from_2018-05-07_12-38-32.png). So, it is the presence of that discarded variable in the Variable Editor that is causing this. But I should note the first time that I had deleted the variable a.b(2).e in the Variable Editor I saw a bad error message dialog and debugging quit and Octave returned to the command line.

Here's an ancillary observation... I didn't follow the example properly with the first attempt. I created the function testConflict resident, not in a file. Octave displays a dialog box about "testConflict does not exist" and should a file be created? See the third attached screen shot (example_2_screen_3_Screenshot_from_2018-05-07_12-47-42.png). This happens with each "dbcont" and also the editor is temporarily raised to the front.

So, the question is what should happen in this scenario? I can say "Yes" and a blank file is then opened and this dialog box stops appearing with new "dbcont", but what state is Octave debugger in then since there is this resident function "testConflict" an empty file "testConflict" (not testConflict.m, but testConflict)? It seems to me this behavior is somewhat arbitrary.

Example 3: Definitely a crash, and it happens at the line

i.e., when the variable a.b is expanded. I see an "octave exited with signal 6". The commands (sans "openvar a") do not crash in the CLI version of Octave. But this is not a debug issue. So I'll create another bug report for this crash bug.

(file #44114, file #44115, file #44116)

Dan Sebald <sebald>
Mon 07 May 2018 04:15:46 PM UTC, comment #2:

For a while, I couldn't get it to repeat the behavior on purpose on either of the two machines I have, but I finally got it. (Or at least similar errors). This one is without debugging something:

This one gets it to happen in a debugging scenario (where I originally found the problem):

I also found a way to reliably crash octave:

Marshall <marsian>
Fri 04 May 2018 10:22:13 PM UTC, comment #1:

Provide a sequence of script code as an example, please.

Dan Sebald <sebald>
Fri 04 May 2018 09:48:39 PM UTC, original submission:

I have found that when I have something opened in the variable editor, and then start debugging things, the command prompt keeps getting "out of bound" error messages every time I step through a function for every variable that is no longer in scope. This is distracting and redundant, since the "Variable ... not found" message is displayed in the variable editor. Can the error message please be removed from showing up in the command window when a variable editor variable is out of scope?

Marshall <marsian>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    Mon 07 May 2018 05:58:54 PM UTC sebald Attached File- => Added example_2_screen_1_Screenshot_from_2018-05-07_12-31-06.png, #44114
        Attached File- => Added example_2_screen_2_Screenshot_from_2018-05-07_12-38-32.png, #44115
        Attached File- => Added example_2_screen_3_Screenshot_from_2018-05-07_12-47-42.png, #44116

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