From: "Nasser M. Abbasi" <nma@12000.org>
Subject: Re: ANN: Ada 2005 Math Extensions 20120712
Date: Sun, 29 Jul 2012 09:22:46 -0500
Date: 2012-07-29T09:22:46-05:00 [thread overview]
Message-ID: <jv3gvj$k0p$1@speranza.aioe.org> (raw)
In-Reply-To: 6ae0b4cc-5ef1-43c0-b93a-8d33408f1a77@googlegroups.com
On 7/29/2012 9:05 AM, Ada novice wrote:
> On Saturday, July 28, 2012 8:33:32 PM UTC+1, Simon Wright wrote:
>
> I've read that ACML is developed with NAG and so getting different results was
>perhaps not something to be expected. Eigenvectors are tricky as they could be
>normalised or not and different normalisation schemes exist. Something would
>have been terribly wrong had the eigenvalues were different!
>
> YC
>
It is the other way around.
Eigenvector times a scalar is still a valid Eigenvector.
(i.e. scaling an eigenvector does not matter).
But if the sign of the eigenvalue is different, then you
need to look into it. Depending on the context, eigenvalue
sign indicate stability or not. So it is important.
--Nasser
next prev parent reply other threads:[~2012-08-01 3:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-12 19:44 ANN: Ada 2005 Math Extensions 20120712 Simon Wright
2012-07-13 11:12 ` Ken Thomas
2012-07-14 8:13 ` Ada novice
2012-07-14 10:43 ` Simon Wright
2012-07-14 14:18 ` Ada novice
2012-07-27 19:23 ` Ada novice
2012-07-27 21:03 ` Simon Wright
2012-07-28 13:01 ` Ada novice
2012-07-28 19:10 ` Simon Wright
2012-07-28 19:33 ` Simon Wright
2012-07-29 14:05 ` Ada novice
2012-07-29 14:22 ` Nasser M. Abbasi [this message]
2012-07-29 14:34 ` Ada novice
2012-07-29 14:52 ` Nasser M. Abbasi
2012-07-29 15:02 ` Ada novice
2012-07-29 15:31 ` Ada novice
2012-07-30 18:59 ` Ada novice
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