My LinearOperator only provides a vmult-interface, nothing else, but for initializing the preconditioner I still need a sparse matrix, thus I can not use the LinearOperator, as far as I understand. Or is there a way to use it?
Am Mittwoch, 24. Juli 2019 17:28:14 UTC+2 schrieb Daniel Arndt: > > Is there then a way to use LinearOperator as Input for a preconditioner? >> Else I still have to form the full system matrix (which I would like to >> avoid). >> > > Most precoditioners require access to individual matrx entries. If the > class you derive from linear operator provides a suitable interface, you > can use it in a preconditioner. > Building suitable preconditioners compatible with matrix-free methods is > non-trivial. The default choice would be PreconditionChebyshev. > > 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 dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/34ca9d5a-5a0c-408a-8479-8d17fcb653f2%40googlegroups.com.
