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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 _______________________________________________________ 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 _______________________________________________________ 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> _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?42743> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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