[petsc-users] about the preconditioned GMRES

[Jed Brown]

On Tue, Jun 5, 2012 at 12:48 PM, RenZhengYong <renzhengyong at gmail.com>wrote:

> Dear Petsc users,
>
> My purpose is to solve AmatX=b, A is a symmetric indefinite matrix.
> Here, I read the manual about the usage of preconditioned GMRES method:
> Given a matrix Pmat which is a good approximation to Amat, and call
>
> PetscErrorCode  KSPSetOperators(KSP ksp,Mat Amat,Mat Pmat,MatStructure flag).
>
> My question is: If I have an explicit good approximation (T) to the inverse of the Amat (that is T=Pmat^{_1}),
> which call will be used to tell the KSP of having this explicit preconditioner.
>
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCMAT.html
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