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[Octave-bug-tracker] [bug #42743] Inconsistent linear algebra results -


From: Ceral Paquet
Subject: [Octave-bug-tracker] [bug #42743] Inconsistent linear algebra results - openblas bug?
Date: Sat, 12 Jul 2014 17:02:00 +0000
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20140618 Firefox/24.0 PaleMoon/24.6.2

URL:
  <http://savannah.gnu.org/bugs/?42743>

                 Summary: Inconsistent linear algebra results - openblas bug?
                 Project: GNU Octave
            Submitted by: octavebugs
            Submitted on: Sat 12 Jul 2014 05:01:59 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: GNU/Linux

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Details:

I switched to OpenBLAS and started noticing a few inconsistent results in
single precision linear algebra calculations. See results below for doing the
same calculation using file attached.

I realize this is probably not an Octave issue but I don't know for sure. I
wonder if someone more knowledgeable can have a look.

This is with a self-compiled OpenBLAS but the same thing happens with the
Debian repo version.

octave:2> weird_bug
ans = 1.64427697658538818359375
octave:3> weird_bug
ans = 1.64427697658538818359375
octave:4> weird_bug
ans = 1.64427721500396728515625
octave:5> weird_bug
ans = 1.64427697658538818359375
octave:6> weird_bug
ans = 1.64427697658538818359375
octave:7> weird_bug
ans = 1.64427697658538818359375
octave:8> weird_bug
ans = 1.64427697658538818359375
octave:9> weird_bug
ans = 1.64427697658538818359375
octave:10> weird_bug
ans = 1.64427697658538818359375
octave:11> weird_bug
ans = 1.64427697658538818359375
octave:12> weird_bug
ans = 1.64427697658538818359375
octave:13> weird_bug
ans = 1.64427697658538818359375
octave:14> weird_bug
ans = 1.64427721500396728515625




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File Attachments:


-------------------------------------------------------
Date: Sat 12 Jul 2014 05:01:59 PM GMT  Name: weird_bug.tar.gz  Size: 33kB  
By: octavebugs

<http://savannah.gnu.org/bugs/download.php?file_id=31706>

    _______________________________________________________

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  <http://savannah.gnu.org/bugs/?42743>

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