petsc-3.11.4 2019-09-28
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KSPComputeExplicitOperator

 Computes the explicit preconditioned operator, including diagonal scaling and null space removal if applicable.

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(), KSPSetDiagonalScale(), KSPSetNullSpace()

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