bugGNU Octave - Bugs: bug #37087, empty struct not empty after being...


bug #37087: empty struct not empty after being saved in MATLAB binary data format.

Submitted by:  Guillaume <gyom>
Submitted on:  Mon 13 Aug 2012 07:14:00 PM UTC  
Category:  Libraries Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Fixed Assigned to:  None
Originator Name:  Guillaume Open/Closed:  Closed
Release:  dev Operating System:  Any

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Tue 16 Oct 2012 07:39:32 PM UTC, comment #8:

Fixed in this changeset (http://hg.savannah.gnu.org/hgweb/octave/rev/39fd2ad26fb7). You will need to pull from the latest Mercurial sources and build from scratch in order to see the fix.

Rik <rik5>
Project Administrator
Tue 16 Oct 2012 12:51:16 AM UTC, comment #7:

I tested the patch and it works fine. How would you like to be credited in the Mercurial ChangeLog? Ordinarily we do "Firstname Lastname <email@address>". If you have privacy concerns we can also work out something else.

Rik <rik5>
Project Administrator
Thu 20 Sep 2012 04:44:07 PM UTC, comment #6:

I've been using this patch for some time now:

It fixed the bug I was reporting and I didn't see any side effect since then.
Could someone review the change and push it if OK? Many thanks.

Guillaume <gyom>
Fri 17 Aug 2012 04:45:18 PM UTC, comment #5:

It seems to work if I change l.1147 of src/interp-core/ls-mat5.cc so that instead of:
Octave_map m (dim_vector (1, 1));
it reads:
Octave_map m (dims);
but then I don't understand how it could work before when one of the dimension of the struct array was greater than 1.

Guillaume <gyom>
Wed 15 Aug 2012 06:27:08 PM UTC, comment #4:

I did actually look at this file earlier but couldn't figure out where the problem was taking place.

Just got GDB running following this:
but nothing meaningful yet...

Guillaume <gyom>
Wed 15 Aug 2012 04:04:45 PM UTC, comment #3:

Sorry, I meant, here:


Jordi Gutiérrez Hermoso <jordigh>
Project Administrator
Wed 15 Aug 2012 03:58:10 PM UTC, comment #2:

Wanna have a stab at debugging the problem yourself? Run Octave in a debugger and set a breakpoint here:


Jordi Gutiérrez Hermoso <jordigh>
Project Administrator
Wed 15 Aug 2012 01:57:12 PM UTC, comment #1:

To be more precise, the problem is with load() and not save(), i.e. file A.mat is fine but is read erroneously (found out by cross-checking with MATLAB).

Guillaume <gyom>
Mon 13 Aug 2012 07:14:00 PM UTC, original submission:

The size of an empty struct (struct([])) changes when saved in MATLAB binary data format:

Guillaume <gyom>


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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2012-10-16 rik5 StatusIn Progress => Fixed
        Open/ClosedOpen => Closed
    2012-10-16 rik5 CategoryNone => Libraries
        StatusNone => In Progress

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