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[Octave-bug-tracker] [bug #61246] matrix inversions give wrong results (

From: Joohwa Lee
Subject: [Octave-bug-tracker] [bug #61246] matrix inversions give wrong results (inv, lu, mldivide)
Date: Thu, 30 Sep 2021 07:12:33 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36 Edg/94.0.992.31 
Follow-up Comment #3, bug #61246 (project octave):

I installed 5.2.0 version and ran the same code.
I got correct results.

[code]
n = 7;
randn('seed',1);
a = randn(n);
x = (1:n)';
b = a * x;
r = x - a \ b;

[r in Ver. 5.2.0]

   3.1086e-15
   6.6613e-15
   2.6645e-15
  -4.4409e-15
  -1.7764e-15
   8.8818e-16
  -3.5527e-15

[r in Ver. 6.3.0]

  -0.1859
   4.6442
   3.4121
  -1.8404
  -1.4111
  -0.4142
  -1.2549

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  <https://savannah.gnu.org/bugs/?61246>

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