[petsc-users] Replace schur solver in fieldsplit by a matrix multiplication

[Thomas Witkowski]

Just to add what I have now is to set the KSP type to PREONLY and the 
preconditioner is a PCSHELL which makes this matrix vector 
multiplication. But is there is simpler way?

Thomas

Am 26.10.2012 11:20, schrieb Thomas Witkowski:
> Is there a simple way to replace the Schur ksp in fieldsplit 
> preconditioner by a matrix multiplication? So, instead of solving with 
> some Schur operator approximation I just want to make a matrix-vector 
> multiplication, where the matrix is a sparse approximation of the 
> inverse of the Schur complement. Thanks for any suggestions!
>
> Thomas