[Trilinos-Users] [EXTERNAL] Replacing ARPACK with Anasazi - Simplest approach?

[Thornquist, Heidi K]

Hi Roland,

There are a couple more pieces of information necessary to direct you to the appropriate solver:

1) If you are looking to determine the stability of the system, you are looking for the values crossing from negative to positive, or the rightmost eigenvalues.  Is that correct?  If so, how many eigenvalues are you trying to calculate?  
2) Is the eigenproblem Hermitian or non-Hermitian?

Thanks,
Heidi

-- 
 
Heidi K. Thornquist
Electrical Models & Simulation
Sandia National Laboratories
 


On 9/26/19, 9:12 AM, "Trilinos-Users on behalf of Roland Richter" <trilinos-users-bounces at trilinos.org on behalf of roland.richter at ntnu.no> wrote:

    Hei,
    
    I would like to calculate the eigenvalues/eigenvectors of an
    Epetra_crsmatrix, and intend to use Anasazi for that (to stay in the
    Trilinos eco system). Now, there are several different methods available
    in the Anasazi framework, but I only need a simple function. Thus, which
    method would be the easiest to use for that?
    
    The matrix contains the Jacobian of a nonlinear system of equations, and
    I would need the values for determining the stability of the system.
    
    Thank you,
    
    regards,
    
    Roland Richter
    
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