[Octave-bug-tracker] [bug #63733] Matlab incompatibility for certain corner case indexing operations

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?63733>

                 Summary: Matlab incompatibility for certain corner case
indexing operations
                 Project: GNU Octave
               Submitter: rik5
               Submitted: Mon 30 Jan 2023 11:56:01 AM PST
                Category: Interpreter
                Severity: 2 - Minor
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Mon 30 Jan 2023 11:56:01 AM PST By: Rik <rik5>
Here are a few incompatibilities for indexing between Matlab and Octave

1)


z = zeros (5,0);
z(3) = 1;


Octave throws an error, while Matlab results in a 1x3 vector.  Interestingly,
Octave gets the same result as Matlab (1x3 vector) if "z = zeros (0, 5)" (see
also example below where column index of 1 seems to be special).

2)


z = zeros (0,1);
z(3) = 1;
size (z)


Octave returns a row vector ([1, 3]) while Matlab returns a column vector ([3,
1]) for this case.

3)


z = zeros (1,2,3,4);
z(5,2) = 1;
size (z)


Octave throws an error, while Matlab returns [5,2,3,4].

4)


z = zeros (1,1,3);
z(5) = 1;
size (z)


Octave throws an error, while Matlab returns [1,1,5].









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