bugGNU Octave - Bugs: bug #44498, isvector: Always returns true for...


bug #44498: isvector: Always returns true for objects from user defined classes

Submitter:  Oliver Heimlich <oheim>
Submitted:  Tue 10 Mar 2015 06:58:06 AM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  siko1056
Originator Name:  Oliver Heimlich Open/Closed:  * Closed
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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( Jump to the original submission )

Thu 04 Oct 2018 10:37:14 PM UTC, comment #7: 

Finally, I pushed a modified version of the patches supplied to default including some note in the NEWS file:

Closing this report.

Kai Torben Ohlhus <siko1056>
Project Member
Wed 18 May 2016 12:56:38 PM UTC, comment #6: 

A patch that solves this issues has been proposed in bug report #43925 and is currently waiting to be reviewed.

Julien Bect <jbect>
Fri 12 Feb 2016 01:27:20 PM UTC, comment #5: 

See bug #43925 for work in progress on this issue.

Julien Bect <jbect>
Sat 30 Jan 2016 02:22:32 AM UTC, comment #4: 

It is easy to replace dims() by size() in Fisvector -- see attached patch.

The wrinkle is that size() is not const, and so a copy has to be made.  That should be a shallow copy, shouldn't it?  If not, we should probably check that size has actually been overloaded and use dims() if not.

(file #36204)

Lachlan Andrew <lachlan>
Tue 26 Jan 2016 05:30:58 AM UTC, comment #3: 

Yes, option 2 should be the right one. The patch for bug #44334 has introduced some xtests regarding this regression. The xtests have been verified for Matlab compatibility.

To summarize the discussion from bug #44334: The user defined class needs to override size and numel. Then other functions should respect this.

Tue 26 Jan 2016 05:02:33 AM UTC, comment #2: 

I'm happy to try to produce a fix if someone confirms that option 2 is the one to go with.  jwe, I think it is your call.

Lachlan Andrew <lachlan>
Tue 02 Jun 2015 04:35:44 PM UTC, comment #1: 

Retagging release from 4.0.0-rc1 to 4.0.0.

John W. Eaton <jwe>
Project Administrator
Tue 10 Mar 2015 06:58:06 AM UTC, original submission:  

The function isvector always returns true for user defined objects (whose builtin size is [1 1]). However, the user defined class may have overridden the size method.

See bug #43925 for a similar regression with isscalar and bug #44334 for a similar regression with iseuqal. In GNU Octave 3.8.2 the overriden size had been respected by isscalar, isvector, and isequal.

What is the desired behaviour?
1) A user-defined class must override all methods together to get a consistent behaviour: size, isvector, isscalar, and isequal. Any builtin functions will assume that the object's size is always [1 1].
2) A user-defined class must override size only. The builtin functions will respect the overriden size method and produce a consistent behaviour for the user (like they did in version 3.8.2).

Oliver Heimlich <oheim>


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Attach Files:

Attached Files
file #36204:  bug_44498.cset added by lachlan (908B - application/octet-stream)


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    Follow 9 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-10-04 siko1056 StatusNone Fixed
        Assigned toNone siko1056
        Open/ClosedOpen Closed
        Release4.0.0 dev
    2018-10-02 siko1056 Dependencies- bugs #51308 is dependent
    2017-02-23 siko1056 Dependencies- Depends on bugs #43925
    2016-07-12 mtmiller Dependencies- bugs #48487 is dependent
    2016-01-30 lachlan Attached File- Added bug_44498.cset, #36204
    2015-06-02 jwe Release4.0.0-rc1 4.0.0

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