petsc-3.4.5 2014-06-29

KSPComputeExplicitOperator

 Computes the explicit preconditioned operator.

Synopsis

#include "petscksp.h" 
PetscErrorCode  KSPComputeExplicitOperator(KSP ksp,Mat *mat)
Collective on KSP

Input Parameter

ksp -the Krylov subspace context

Output Parameter

mat -the explict preconditioned operator

Notes

This computation is done by applying the operators to columns of the identity matrix.

Currently, this routine uses a dense matrix format when 1 processor is used and a sparse format otherwise. This routine is costly in general, and is recommended for use only with relatively small systems.

Keywords

KSP, compute, explicit, operator

See Also

KSPComputeEigenvaluesExplicitly(), PCComputeExplicitOperator()

Level:advanced
Location:src/ksp/ksp/interface/eige.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages