Hi Andreas, On Thursday, July 4, 2019 at 7:41:31 PM UTC+2, Andreas Hegendörfer wrote: > > Hello, > > 2. Are there better ways to solve this Eigenproblem, maybe with another > solver? > > Have you tried an spectral transformation? I'm not familiar with Arpack, I use SLEPc. I think that you could use the function ArpackSolver::set_shift(). sigma is your guess for the eigenvalue.
Note that if you use an spectral transformation, you can not use an iterative solver. You have to use a direct solver, but it considerably accelerates the eigenvalue calculation. If your eigenvalue is from the interior of the spectrum and you don't do an spectral transformation, it can take very long. Best, Daniel -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/a157c16e-4e0e-4b13-bd8d-ca3b2258fd30%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
