[Octave-bug-tracker] [bug #40374] incorrect broadcasting with non diagonal matrices

[jose]

URL:
  <http://savannah.gnu.org/bugs/?40374>

                 Summary: incorrect broadcasting with non diagonal matrices
                 Project: GNU Octave
            Submitted by: josombio
            Submitted on: Fri 25 Oct 2013 05:10:21 PM GMT
                Category: Octave Function
                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: 3.6.4
        Operating System: GNU/Linux

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Details:

I have read several bug reports about cases in which broadcasting does not
work properly, such as #39462 and #38466. The first one is about diagonal
matrices, and is closed. This report might be related to the second one.

In octave 3.6.4 there are cases in which broadcasting does not work well
involving non diagonal matrices. Just in case this is not known/solved, here I
point it out.

Examples of diagonal matrices:
--------------
octave:6> clear
octave:7> 
octave:8> d=[1 2 3];
octave:9> d.+=ones(3)
error: +=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:9> d.-=ones(3)
error: -=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:9> d./=ones(3)
error: ./=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:9> d.*=ones(3)
error: .*=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:9> d.*=rand(3)
error: .*=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:9> d.*=eye(3); %this works
------------
An now non diagonal
------------
octave:1> d=[1 2 3];
octave:2> d.*=rand(3)
error: .*=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:2> d.+=rand(3)
error: +=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:2> d.-=rand(3)
error: -=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:2> d./=rand(3)
error: ./=: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:2> d./=rand(3)
------------






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