>First, configure with Hypre . You mean, configure for the installation of PETSC with hypre? thanks.
>Then -pc_type hypre -pc_hypre_type boomeramg You mean, without adding any information into code include, just compile and link the code, to get an excuteable file, e.g. "a.out", then a.out -pc_type hypre -pc_hypre_type boomeramg is it right? thanks. >I cannot understand exactly what you mean. However, if you want to create a PC > based upon a >matrix which is not the system matrix A, you can specify it in > KSPSetOperators(). I mean Ax =b doesn't have A in explicit form, but in expression A=B+C1+C2+...+Cn, where B is main part of A in an explicity form, C1, C2,... and Cn are small portions comparing with B and they don't have an explicit form. Thus I want to make a preconditioner from B, then apply the preconditioner to Ax=b. Please tell me how I can do by PETSC sentences for PETSC solver, thanks. David On Sun, Mar 7, 2010 at 12:32 AM, Matthew Knepley <knepley at gmail.com> wrote: > On Sat, Mar 6, 2010 at 11:49 PM, David sheehan <david.sheehanjr at > gmail.com>wrote: > >> Hi, >> I need your helps about PETSC as follows: >> 1) how can I call boomerAMG of HYPRE through PETSC as a solver and a >> preconditioner? >> > > First, configure with Hypre . Then -pc_type hypre -pc_hypre_type boomeramg > > >> 2) how can I make a precondioner from B matrix, but apply the >> preconditioner to Ax=b in PETSC? >> Thanks in advance. >> > > I cannot understand exactly what you mean. However, if you want to create a > PC based upon a matrix > which is not the system matrix A, you can specify it in KSPSetOperators(). > > Matt > > >> David >> > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20100307/378213f4/attachment.html>
