[Octave-bug-tracker] [bug #61238] Diagonal Martices are not implicitly converted when adding/subtracting

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61238>

                 Summary: Diagonal Martices are not implicitly converted when
adding/subtracting
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 28 Sep 2021 05:35:25 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: Sal
        Originator Email: salBakraa@gmail.com
             Open/Closed: Open
                 Release: 6.3.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

I was confused that I got an error when adding an identity matrix but not when
I was using a regular matrix with the same dimensions.


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octave:1> a = eye(3); b = ones(1,3); c = full(a);
octave:2> a + b
error: operator +: nonconformant arguments (op1 is 3x3, op2 is 1x3)
octave:3> b + a
error: operator +: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:4> a - b
error: operator -: nonconformant arguments (op1 is 3x3, op2 is 1x3)
octave:5> b - a
error: operator -: nonconformant arguments (op1 is 1x3, op2 is 3x3)
octave:6> b + c
ans =

   2   1   1
   1   2   1
   1   1   2

octave:7> c + b
ans =

   2   1   1
   1   2   1
   1   1   2

octave:8> b - c
ans =

   0   1   1
   1   0   1
   1   1   0

octave:9> c - b
ans =

   0  -1  -1
  -1   0  -1
  -1  -1   0


I am not sure if this happens for other algebraic operations, since even
though I tested them; I am not aware of what the correct output should be. 




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