[Octave-bug-tracker] [bug #56172] concatenation of empty, 2-D, but not 0x0 arrays differs from Matlab

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?56172>

                 Summary: concatenation of empty, 2-D, but not 0x0 arrays
differs from Matlab
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Fri 19 Apr 2019 10:54:46 AM PDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Yet another corner case involving concatenation.

In Octave, this code produces an error


[zeros(0,1), zeros(0,1), 1]
error: horizontal dimensions mismatch (0x2 vs 1x1)


However, in Matlab it succeeds with a result of [1], but it does throw a
warning message.


Warning: this concatenation operation includes an empty array with an
incorrect number of rows.
Concatenation including empty arrays will require all arrays to have the same
number of rows in a future release.


The related code where the concatenated matrix is 0x0 works, and produces no
error or warning.


[zeros(0,0), zeros(0,0), 1]


It seems like it would be useful to support current Matlab behavior because
this syntax has probably been used in 25 years of m-file code.

Related bugs (resolved) are bug #31615 and bug #49759.






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