From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,35f6cee6f665d64b
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.224.186.143 with SMTP id cs15mr11564618qab.3.1343792181500;
        Tue, 31 Jul 2012 20:36:21 -0700 (PDT)
Received: by 10.68.201.129 with SMTP id ka1mr3465545pbc.4.1343789455952;
        Tue, 31 Jul 2012 19:50:55 -0700 (PDT)
Path: 
 a15ni14729222qag.0!nntp.google.com!h9no3267077pbv.0!news-out.google.com!g9ni9633010pbo.0!nntp.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nrc-news.nrc.ca!goblin1!goblin.stu.neva.ru!eternal-september.org!feeder.eternal-september.org!mx04.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: ANN: Ada 2005 Math Extensions 20120712
Date: Sat, 28 Jul 2012 20:33:32 +0100
Organization: A noiseless patient Spider
Message-ID: <m2ehnvpto3.fsf@nidhoggr.home>
References: <m2k3y8ydap.fsf@nidhoggr.home>
	<167ecede-3588-45f0-904b-06a8be4cfec7@googlegroups.com>
	<m24npay65y.fsf@nidhoggr.home>
	<2ba72d4e-6e88-4900-8232-c075242dec1f@googlegroups.com>
	<65f76f80-a1e5-4c60-8002-45becc2a1198@googlegroups.com>
	<m2mx2kq5me.fsf@nidhoggr.home>
	<e1d5d31c-f873-4910-8bf3-6700a17007d1@googlegroups.com>
Mime-Version: 1.0
Injection-Info: mx04.eternal-september.org;
 posting-host="edf2659fbb8cb6d4b5f62db4b36ac1e6";
	logging-data="18956"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX19nqfKeKnfPsujBg8hdcL7mLe9t0+mPMZw="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (darwin)
Cancel-Lock: sha1:VNwBLbn4yTigpW2mOicnV03TfKk=
	sha1:orSdge9oIFw1RWzv1b/wGxYSILQ=
Content-Type: text/plain
Date: 2012-07-28T20:33:32+01:00
List-Id: <comp.lang.ada>

Ada novice <shai.lesh@gmx.com> writes:

> When running "demo_extensions", I saw some differences in the outputs
> (in the last example for instance).

The last example comes from
http://www.nag.co.uk/lapack-ex/node122.html. The results
(http://www.nag.co.uk/lapack-ex/examples/results/zggev-ex.r) look a lot
more like the Debian output you list than the ACML output.

FWIW the Mac OS X 10.7.4 output is

ZGGEV example at http://www.nag.co.uk/lapack-ex/node122.html

Eigenvalue( 1) = ( 3.00000E+00,-9.00000E+00)
Eigenvector( 1) = ( 8.37379E-01, 1.62621E-01)( 1.53495E-01,-7.44663E-02)( 7.44662E-02, 1.53495E-01)(-1.53495E-01, 7.44663E-02)
Eigenvalue( 2) = ( 2.00000E+00,-5.00000E+00)
Eigenvector( 2) = (-6.29583E-01,-3.70417E-01)(-4.14824E-03, 4.65175E-04)(-3.95739E-02,-2.32833E-02)( 2.32834E-02,-3.95739E-02)
Eigenvalue( 3) = ( 3.00000E+00,-1.00001E+00)
Eigenvector( 3) = ( 9.77535E-01, 2.24653E-02)( 1.59101E-01,-1.13710E-01)( 1.20898E-01,-1.53710E-01)( 1.53710E-01, 1.20898E-01)
Eigenvalue( 4) = ( 4.00000E+00,-5.00000E+00)
Eigenvector( 4) = ( 9.06236E-01,-9.37645E-02)( 7.43045E-03,-6.87512E-03)(-3.02078E-02, 3.12552E-03)( 1.45859E-02, 1.40970E-01)

which has similar absolute values but the signs of all except (3) are
reversed; and are the same as the outputs of the NAG test program/data.

I'm not a numerical analyst, so I have no idea whether these differences
represent bugs or features.