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

From: Carnë Draug
Subject: [Octave-bug-tracker] [bug #44316] eq () between two permutations is not element-wise
Date: Thu, 19 Feb 2015 21:52:17 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.4.0


                 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



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


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


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