On Wed, Dec 21, 2011 at 1:37 PM, Geoffrey Irving wrote:
> On Wed, Dec 21, 2011 at 3:56 AM, Charles R Harris
> wrote:
> > Hi Geoffrey,
> >
> > On Tue, Dec 20, 2011 at 7:24 PM, Geoffrey Irving wrote:
> >>
> >> Hello,
> >>
> >> As a followup to the prior thread on bugs in user defined types in
> >
In article
,
Ralf Gommers wrote:
> On Tue, Dec 20, 2011 at 10:52 PM, Russell E. Owen wrote:
>
> > In article ,
> > "Russell E. Owen" wrote:
> >
> > > In article
> > > ,
> > > Ralf Gommers wrote:
> > >
> > > > On Fri, Dec 9, 2011 at 8:02 PM, Russell E. Owen wrote:
> > > >
> > > > > I'm tr
In article
,
Ralf Gommers wrote:
> On Tue, Dec 20, 2011 at 10:52 PM, Russell E. Owen wrote:
>
> > In article ,
> > "Russell E. Owen" wrote:
> >
> > > In article
> > > ,
> > > Ralf Gommers wrote:
> > >
> > > > On Fri, Dec 9, 2011 at 8:02 PM, Russell E. Owen wrote:
> > > >
> > > > > I'm tr
On Wed, Dec 21, 2011 at 3:56 AM, Charles R Harris
wrote:
> Hi Geoffrey,
>
> On Tue, Dec 20, 2011 at 7:24 PM, Geoffrey Irving wrote:
>>
>> Hello,
>>
>> As a followup to the prior thread on bugs in user defined types in
>> numpy, I converted my rational number class from C++ to C and switched
>> to
On Tue, Dec 20, 2011 at 10:48 PM, Christopher Jordan-Squire wrote:
> On Tue, Dec 20, 2011 at 9:10 PM, Mark Wiebe wrote:
> > On Tue, Dec 20, 2011 at 6:24 PM, Geoffrey Irving wrote:
> >>
> >> Hello,
> >>
> >> As a followup to the prior thread on bugs in user defined types in
> >> numpy, I convert
I read it like that:
(**T is the transpose)
Let's call M the mass matrix and N the modal mass matrix. Then
X**T*M*X=N. If X (matrix of eigenvectors) is normalized with respect to
M, N is I (unity) so it just mean that X**T*M*X=I. That is what octave
and matlab give you.
For this to be true. x**
Hi Geoffrey,
On Tue, Dec 20, 2011 at 7:24 PM, Geoffrey Irving wrote:
> Hello,
>
> As a followup to the prior thread on bugs in user defined types in
> numpy, I converted my rational number class from C++ to C and switched
> to 32 bits to remove the need for unportable 128 bit numbers. It
> shou
According to this page eigenvectors are normalized with respect to the
second matrix. Do you guys have any idea how that's done?
http://www.kxcad.net/Altair/HyperWorks/oshelp/frequency_response_analysis.htm
"If the eigenvectors are normalized with respect to the mass matrix, the
modal mass matr
Just to be completely clear, there is no such thing as a
"non-normalized" eigenvector. An eigenvector is only determined *up to a
scalar normalization*, which is obvious from the eigenvalue equation:
A v = l v
where A is the matrix, l is the eigenvalue, and v is the eigenvector.
Obviously v is
Aaah, thanks a lot Lennart, I knew there had to be some logic to Octave's
output, but I couldn't see it...
-=- Olivier
2011/12/21 Lennart Fricke
> Dear Fahreddın,
> I think, the norm of the eigenvectors corresponds to some generic
> amplitude. But that is something you cannot extract from the s
Dear Fahreddın,
I think, the norm of the eigenvectors corresponds to some generic
amplitude. But that is something you cannot extract from the solution of
the eigenvalue problem but it depends on the initial deflection or
velocities.
So I think you should be able to use the normalized values just
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