Re: [deal.II] Re: Eigenproblem and creating a preconditioner out of a linear operator, Eigensolver Selection

2021-09-17 Thread Anton Ermakov
Dear Daniel, I am working on a similar problem (planetary acoustic oscillations). I am interested in looking at your tutorial for an electromagnetic cavity, but it seems that the pull request was deleted. I wonder if it can be revived. Thank you, Anton. On Monday, July 8, 2019 at 3:51:08 AM

Re: [deal.II] Re: Eigenproblem and creating a preconditioner out of a linear operator, Eigensolver Selection

2019-07-09 Thread 'Andreas Hegendörfer' via deal . II User Group
Hi Daniel, thank you very much for your great help! I think your tutorial is very helpful. I think one important part of your tutorial is, that you use SLEPcWrappers::TransformationShiftInvert shift. When I was new to the topic of eigenvalues calculation in deal.ii a few weaks ago I only built

Re: [deal.II] Re: Eigenproblem and creating a preconditioner out of a linear operator, Eigensolver Selection

2019-07-08 Thread Daniel Garcia-Sanchez
Hi Andreas, On Sunday, July 7, 2019 at 4:26:39 PM UTC+2, Andreas Hegendörfer wrote: > > I also tried a spectral transformation with the Arpack solver with the > same result as without spectral transformation. I am interested in the > smallest real eigenvalues. I know from previous calculations

Re: [deal.II] Re: Eigenproblem and creating a preconditioner out of a linear operator, Eigensolver Selection

2019-07-07 Thread 'Andreas Hegendörfer' via deal . II User Group
Hi Daniel, thank you very much for your answer! I also tried a spectral transformation with the Arpack solver with the same result as without spectral transformation. I am interested in the smallest real eigenvalues. I know from previous calculations with the Krylov Schur solver form SLEPc that