[Octave-bug-tracker] [bug #54356] Unsolvable linear equation system was "solved"

[Sergiy Balanetskyy]

URL:
  <http://savannah.gnu.org/bugs/?54356>

                 Summary: Unsolvable linear equation system was "solved"
                 Project: GNU Octave
            Submitted by: dr_balan
            Submitted on: Mon 23 Jul 2018 04:31:40 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Missed Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: \
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.0
        Operating System: Microsoft Windows

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Details:

The system below cannot be solved (because of rank(A)<rank([A B]), but the
octave returns a solution!

>> A=[1 1 -1
-2 0 1
5 -1 2
2 6 -3]
A =

   1   1  -1
  -2   0   1
   5  -1   2
   2   6  -3

>> B=[2
-2
4
5]
B =

   2
  -2
   4
   5

>> A\B
ans =

   0.97051
   0.40433
  -0.23198





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