[Trilinos-Users] anasazi and eigs with singular matrix

[Thornquist, Heidi K]

Hi Simone,

Yes, we have experience with this type of problem.  In fact, an example
for solving something similar
to this can be found in BlockKrylovSchurEpetraExGen.cpp.  What specific
eigenvalues are you looking to
compute for this generalized problem (Ax = \lambda Bx), i.e. largest
magnitude, smallest magnitude, rightmost?
I would be glad to help you set this up.  If you want to take a look at
the example, we can start there.

Thanks,
Heidi

************************************************************************
**
Heidi K. Thornquist
Sandia National Labs
P.O. Box 5800, MS 0316
Albuquerque, NM  87185-0316
Office:  (505)284-8426
Fax:  (505)284-5451


-----Original Message-----
From: trilinos-users-bounces at software.sandia.gov
[mailto:trilinos-users-bounces at software.sandia.gov] On Behalf Of Simone
Deparis
Sent: Thursday, December 01, 2005 2:05 PM
To: trilinos-users at software.sandia.gov
Subject: [Trilinos-Users] anasazi and eigs with singular matrix

Hello,

I have an eigenvalue problem of the form Ax = \lambda B x

where B is a singular matrix (positive semidefinite).
I am interested in modes orthogonal to the zero mode and I whish to use
the Anasazi::BlockKrylovSchur method.

Does somebody have an experience with something similar?

Thank you
Simone

_____________________________________________________________________
                                    Simone Deparis
  .~.                               Mech Eng Dept - MIT
  /V\   L   I   N   U   X           77 Mass Ave Room 3-264
 // \\  =================           Cambridge MA 02139
/(   )\                             USA
 ^^-^^
phone :  +1 617 452 3285  mailto:deparis at mit.edu
fax   :  +1 617 258 8559  http://www.mit.edu/~deparis
_____________________________________________________________________



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