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[Octave-bug-tracker] [bug #57175] Incorrect output using rref() function


From: anonymous
Subject: [Octave-bug-tracker] [bug #57175] Incorrect output using rref() function on integer matrix
Date: Tue, 5 Nov 2019 23:33:12 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0

URL:
  <https://savannah.gnu.org/bugs/?57175>

                 Summary: Incorrect output using rref() function on integer
matrix
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 06 Nov 2019 04:33:10 AM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Josh
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.2
        Operating System: GNU/Linux

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Details:

I attempted running the following lines:

 A = [0,0,1,1,6;1,5,0,0,-28;0,0,-1,-25,-102;-1,-125,0,0,622]
rref(A)

The correct answer ought to be:
   1.00000   0.00000   0.00000   0.00000  -3.00000
   0.00000   1.00000  -0.00000  -0.00000  -5.00000
   0.00000   0.00000   1.00000   0.00000   2.00000
   0.00000   0.00000   0.00000   1.00000   4.00000

But is returned as:
   1.00000   0.00000   0.00000   0.00000  -3.25000
   0.00000   1.00000  -0.00000  -0.00000  -4.95000
   0.00000   0.00000   1.00000   0.00000   2.00000
   0.00000   0.00000   0.00000   1.00000   4.00000




    _______________________________________________________

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  <https://savannah.gnu.org/bugs/?57175>

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