bugGNU Octave - Bugs: bug #49659, Non-empty ouput for non-matching...


bug #49659: Non-empty ouput for non-matching regexp with 'names' option

Submitted by:  Guillaume <gyom>
Submitted on:  Mon 21 Nov 2016 12:38:16 PM UTC  
Category:  Octave Function 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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Mon 09 Jan 2017 05:06:17 PM UTC, comment #3:

I checked in a fix here (http://hg.savannah.gnu.org/hgweb/octave/rev/cb09392b5b1c). I also added an announcement to the NEWS file since some coders may be relying on the existing format.

Rik <rik5>
Project Administrator
Mon 21 Nov 2016 05:50:34 PM UTC, comment #2:

Interesting. This feature was probably implemented without a lot of checking for Matlab compatibility. It should be relatively easy to return a struct array, rather than a scalar structure.

The file to modify is regexp.cc in libinterp/corefcn.

There are two functions, octregexp and octcellregexp, which probably need modification. The relevant code for octregexp is shown below.

As you can see, in the case of multiple return arguments, it creates a temporary cell and stuffs the results into that cell array, and then assigns to the structure, under the ptn name, the temporary cell array.

Rik <rik5>
Project Administrator
Mon 21 Nov 2016 12:53:19 PM UTC, comment #1:

The output also differs if there is more than one match as the output should be a structure array but Octave creates a structure with cell arrays in fields:

while Matlab does:

Guillaume <gyom>
Mon 21 Nov 2016 12:38:16 PM UTC, original submission:

Octave's output differs from Matlab's when using the 'names' flag and nothing matches.


and Matlab:

Guillaume <gyom>


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-01-09 rik5 StatusNone => Fixed
        Open/ClosedOpen => Closed

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