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Re: Request for test

From: Isak Delberth Davids
Subject: Re: Request for test
Date: Sat, 22 Jan 2011 09:55:59 +0200

On 13 January 2011 22:10, CdeMills <address@hidden> wrote:


I would like to have the following test performed on machines similar to
mine. I openened a bug report at

Test: do twice
[1+i 2+i ; 3+i 4+i ] * [5+i ; 6+i]

ans =

 15 + 14i
 37 + 18i

Wrong result
ans =

17 + 11i
39 + 11i

It seems that this occurs under Ubuntu 10.04 LTS on i686 machines, with
library libatlas3gf-sse2, version 3.6.0-24ubuntu1: i386, installed. Could
peoples having access to I686 machines running either Ubuntu 10.04, either
debian stable, test if
/usr/bin/octave -f
 generates the wrong result, AND
LD_PRELOAD= /usr/lib/   /usr/bin/octave -f
gives the right result ? This would indicate bugs in libatlas-sse2 "ZEMM"

Thanks in advance

Pascal Dupuis

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I hope my reply is not too late, it took me some time to react ... sorry

I run Ubuntu 10.04 on a old laptop, when I do "cat /etc/issue" in a terminal, I get "Ubuntu 10.04.1 LTS \n \l" and from "uname -a" I get "Linux delbert 2.6.32-27-generic #49-Ubuntu SMP Wed Dec 1 23:52:12 UTC 2010 i686 GNU/Linux"

And here is my test result on octave-3.2.3
octave:1> [1+i 2+i ; 3+i 4+i ] * [5+i ; 6+i]
ans =

   15 + 14i
   37 + 18i

octave:2> [1+i 2+i ; 3+i 4+i ] * [5+i ; 6+i]
ans =

   15 + 14i
   37 + 18i

I hope this contributes --- if I did not missed a point.


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