[petsc-users] about the preconditioned GMRES

[RenZhengYong]

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.

Thanks in advance for your suggestions.

Best wishes
Zhengyong



-- 
Zhengyong Ren
AUG Group, Institute of Geophysics
Department of Geosciences, ETH Zurich
NO H 47 Sonneggstrasse 5
CH-8092, Zürich, Switzerland
Tel: +41 44 633 37561
e-mail: zhengyong.ren at aug.ig.erdw.ethz.ch
Gmail: renzhengyong at gmail.com
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