bugGNU Octave - Bugs: bug #44596, Post debug phenomena


bug #44596: Post debug phenomena

Submitted by:  Avinoam Kalma <avinoam>
Submitted on:  Fri 20 Mar 2015 09:57:54 PM UTC  
Category:  GUI Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Other
Status:  Confirmed Assigned to:  None
Originator Name:  Avinoam Open/Closed:  Open
Release:  4.2.0 Operating System:  Any

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( Jump to the original submission)

Wed 28 Dec 2016 08:43:32 PM UTC, comment #6:

I also see this on LINUX (Octave 4.2.0, self compiled from official release tar-ball, under Ubuntu 16.04):

  • I do the very same steps as described in the first code box of comment #5. The command promt looks alright afterwards (">> "). But when I then press the "Enter" key in the Command Windows Tab, nothing happens. No new command line appears. Even after typing "2+2", pressing Enter, and receiving the answer "ans = 4" nothing will happen after pressing the Enter key again on the new empty command line.
  • After execution of the second code box of comment #5, the behavior is the very same (still Linux) as described above for the first code box.
Hartmut <hardy>
Wed 28 Dec 2016 06:13:55 PM UTC, comment #5:

I can only get this to happen on Windows, not Linux. I used

More interesting behavior, again only on Windows, with this code:

There was an extra ">\n" in the output buffer.

This is likely to be caused by the use of the _db_next_breakpoint_quiet_ function within the GUI which sets

A complete stab in the dark, but maybe somewhere we need a std::endl instead of just "\n" so that the output is truly flushed somewhere in the print routines.

Rik <rik5>
Project Administrator
Sat 24 Dec 2016 07:45:37 AM UTC, comment #4:

Changing OS to any and and release to 4.2.0

Avinoam Kalma <avinoam>
Project Member
Fri 23 Dec 2016 10:04:02 PM UTC, comment #3:

This issue is (at least partly) still present in Octave 4.2.0.

After the debugging procedure described in comment #0, I still do not get a new line when pressing the return key on a blank line.

This happens also in Linux, not just under Windows as it is currently suggested be the tags.

Hartmut <hardy>
Tue 02 Jun 2015 04:32:47 PM UTC, comment #2:

Retagging release from 4.0.0-rc1 to 4.0.0.

John W. Eaton <jwe>
Project Administrator
Fri 20 Mar 2015 11:50:06 PM UTC, comment #1:


I wonder if it is related to the fact that pressing return on a blank line does not, in fact, advance to the next line as it does in Linux. It may be that the 'continue' button issues a newline to the command window which, instead of going to the next line, merely redraws the prompt and remains in place at the same vertical location.

Rik <rik5>
Project Administrator
Fri 20 Mar 2015 09:57:54 PM UTC, original submission:

I set a breakpoint in a routine, for example in isprime.m, line 66,
and write


the program hits the breakpoint, and Octave enters debug mode.
I press continue, the program continues and exits debug mode.
If I do it again (a=isprime(2) and then continue) I get

>> ug>

which is caused from the leftovers of debug, and the regular prompt
(see attached file). Moreover, if I press ENTER Octave does not
move the cursor to the next line, unless another character is typed.

Avinoam Kalma <avinoam>
Project Member


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

Attach Files:

Attached Files
file #33415:  debug.png added by avinoam (102KiB - image/png)


Depends on the following items: None found

Items that depend on this one: None found


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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-12-24 avinoam Release4.0.0 => 4.2.0
        Operating SystemMicrosoft Windows => Any
    2015-06-02 jwe Release4.0.0-rc1 => 4.0.0
    2015-03-23 rik5 StatusNone => Confirmed
    2015-03-20 avinoam Attached File- => Added debug.png, #33415

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