From: Ada novice <shai.lesh@gmx.com>
Cc: nma@12000.org
Subject: Re: ANN: Ada 2005 Math Extensions 20120712
Date: Sun, 29 Jul 2012 07:34:34 -0700 (PDT)
Date: 2012-07-29T07:34:34-07:00 [thread overview]
Message-ID: <00b425bc-6af1-4062-be58-f98012d155c6@googlegroups.com> (raw)
In-Reply-To: <jv3gvj$k0p$1@speranza.aioe.org>
On Sunday, July 29, 2012 3:22:46 PM UTC+1, Nasser M. Abbasi wrote:
>
> It is the other way around.
>
Yes I know about eigenvalues and stability in the complex plane. This is why I said that something would have been terribly wrong if Debian lapack and ACML were not agreeing on the eigenvalues.
Yes eigenvectors show just the relatives maginitudes between DOFs as for example in vibrations. So as you say, scaling is not an issue. A beam can either bend upwards or downwards in its banana first mode shape and so a multiplication with a scalar value say of -1 does not affect the relative magnitudes between the different DOFs and we have the same information regarding the mode shape of the beam.
What I meant with the eigenvectors is that there are different ways of normalising. Normally the total length of an eigenvector is scaled to unity. Different normalisations exist also.
YC
next prev parent reply other threads:[~2012-07-29 14:34 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
2012-07-29 14:34 ` Ada novice [this message]
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
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox