In my project I already managed to replace the system_matrix in the solve()-call by a custom LinearOperator, but still I had to retain the matrix itself (for the preconditioner, for example). Thus I am now trying to use the MatrixFree-framework for that. Thus, some questions arose:
- When using the LinearOperator, the function vmult() is used when solving the system with a GMRES-solver (or similar). Does the same hold up for the MatrixFree-framework? - If the above is correct: In each GMRES-iteration I have to calculate the residual of my equation, once for the current solution and once for the current solution + a small step. At the moment I calculate the residual by summing the terms into my residual vector, and then distributing the values while setting the boundary condition to 0. If I understand it correctly, that happens as soon as I call phi.distribute_local_to_global(dst), with phi a FEEvaluation-element. This means that I first have to assemble the residual vector, then distribute it, and then can use the vmult-function. Is that correct, or do I have to use another approach? Thanks! -- 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/a2dd198f-513d-4ee0-9ebc-2da339b4f133%40googlegroups.com.
