[Numpy-discussion] Fwd: Collection.findTransformation() never stops

Bill Baxter wbaxter at gmail.com
Mon Sep 18 20:34:50 CDT 2006


Hey there,
I don't see anything called "LinearAlgegra.eigenvectors()".  Do you
maybe mean numpy.linalg.eig?
Which version of numpy are you using?
The latest release is 1.0b5.

>>> import numpy
>>> numpy.__version__
'1.0b5'

>>> numpy.linalg.eig([[2,1],[1,2]])
(array([ 3.,  1.]),
 array([[ 0.70710678, -0.70710678],
       [ 0.70710678,  0.70710678]]))

I'm on WindowsXP, though.
Regards,
Bill

On 9/19/06, Dr. Seth Olsen <seth.olsen at gmail.com> wrote:
>
> Hi Numpyers,
>
> I recently sent the message below to the MMTK mailing list, but it's really
> a problem with LinearAlgebra.py.  The routine LinearAlgebra.eigenvectors()
> never stops, even when I try to diagonalize a very simple 2x2 matrix.  I've
> tried this on two machines with completely standard FC4 and FC5
> installations using the default libraries and atlas libraries downloaded and
> installed via yum.  Does anyone on this list have any experience with this
> problem?
>
> Cheers,
>
> Seth
>
> ---------- Forwarded message ----------
> From: Dr. Seth Olsen <seth.olsen at gmail.com >
> Date: Sep 19, 2006 10:38 AM
> Subject: Re: Collection.findTransformation() never stops
> To: mmtk at python.net, mmtk at starship.python.net
>
>
> Hi MMTKers,
>
> The problem with Collection.findTransformation() that I reported earlier is
> due to a problem with LinearAlgebra.eigenvectors().  This algortithm does
> not seem to stop - it can't even manage to find the eigenvectors of the 2x2
> square matrix [[2,1],[1,2]].  Asking for this causes a long wait followed by
> CPU overheat warnings.  Moreover, I have recompiled Numeric23.8 with newly
> installed atlas libraries, but it still won't work.  I have had this problem
> now on 2 machines (one running FC4 with , the other FC5, both pentium 4
> machines), with atlas lapack/blas libraries installed freshly via yum and
> linked as per the recommendations found in setup.py.  THE FEDORA
> INSTALLATIONS ON BOTH MACHINES IS STANDARD - everything has been downloaded
> and installed via the fedora yum repositories.
>
> As the eigenvectors() routine in LinearAlgebra.py is obviously going to be a
> heavily used algorithm (not just in MMTK), is it really possible that no one
> has had this problem before?
>
> Cheers,
>
> Seth
>
>
>  On 9/18/06, Dr. Seth Olsen <seth.olsen at gmail.com> wrote:
> >
> >
> > Hi MMTKers,
> >
> > I'm having a bit of trouble with
> MMTK.Collection.findTransformation.  When I use this member
> function, the computer never stops thinking until I kill the process.  I've
> waited a couple of hours and still nothing.  I get the same thing if I try
> to take a step back and use
> Collection.findTransformationAsQuaternion.  Has anyone had
> this problem before?
> >
> > Cheers,
> >
> > Seth
> >
> > --
> >
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
> >
> > Dr Seth Olsen, PhD
> > Postdoctoral Fellow, Biomolecular Modeling Group
> > Centre for Computational Molecular Science
> > Australian Institute for Bioengineering and Nanotechnology (Bldg. 75)
> > The University of Queensland
> > Qld 4072, Brisbane, Australia
> >
> > tel (617) 3346 3976
> > fax (617) 33654623
> > email: s.olsen1 at uq.edu.au
> > Web: www.ccms.uq.edu.au
> >
> >
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
> > The opinions expressed here are my own and do not reflect the positions of
> the University of Queensland.
>
>
>
> --
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
>
> Dr Seth Olsen, PhD
> Postdoctoral Fellow, Biomolecular Modeling Group
> Centre for Computational Molecular Science
> Australian Institute for Bioengineering and Nanotechnology (Bldg. 75)
> The University of Queensland
> Qld 4072, Brisbane, Australia
>
> tel (617) 3346 3976
> fax (617) 33654623
> email: s.olsen1 at uq.edu.au
> Web: www.ccms.uq.edu.au
>
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
> The opinions expressed here are my own and do not reflect the positions of
> the University of Queensland.
>
> --
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
>
> Dr Seth Olsen, PhD
> Postdoctoral Fellow, Biomolecular Modeling Group
> Centre for Computational Molecular Science
> Australian Institute for Bioengineering and Nanotechnology (Bldg. 75)
> The University of Queensland
> Qld 4072, Brisbane, Australia
>
> tel (617) 3346 3976
> fax (617) 33654623
> email: s.olsen1 at uq.edu.au
> Web: www.ccms.uq.edu.au
>
> ccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccmsccms
> The opinions expressed here are my own and do not reflect the positions of
> the University of Queensland.
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