[Octave-bug-tracker] [bug #44316] eq () between two permutations is not element-wise

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?44316>

                 Summary: eq () between two permutations is not element-wise
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Thu 19 Feb 2015 21:52:16 GMT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

If two matrices are of permutation matrix datatype, the equal comparison
returns a scalar instead of an element-wise operation.

Example:


octave> [~, ~, P] = lu (magic (3))
P =

Permutation Matrix

   1   0   0
   0   0   1
   0   1   0

octave> P == P
ans =  1
octave> P != P
ans =  0
octave> typeinfo (P)
ans = permutation matrix


instead, it should return a 3x3 matrix. This bug was already present in Octave
3.8. It works properly as soon as one of the arguments is not a permutation
matrix.






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