Earl, I am posing this question purely out of personal interest: what do you mean > by maximum and minimum eigenvalue? I am confused by this. > > The eigenvalues with largest and smallest magnitude. My problem is symmetric positive-definite, thus the spectrum is real and positive, so in my case "minimum eigenvalue" makes sense.
Bruno, I think I finally have a solution. By increasing Arnoldi space size, I obtained results that seems ok. I think the documentation of arpack solver is not valid: https://www.dealii.org/developer/doxygen/deal.II/classArpackSolver.html#afdc3aa9d761c43b5b4132e731c6191a5 A The operator for which we want to compute eigenvalues. Actually, this parameter is entirely unused.*Actually, this parameter is entirely unused*.The matrix A is obviously used. Also, calling arpack with WhichEigenvalues::both_ends always results in a crash. Thanks for help, Michał -- 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]. For more options, visit https://groups.google.com/d/optout.
