KSPComputeOperator#

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

Synopsis#

#include "petscksp.h" 
PetscErrorCode KSPComputeOperator(KSP ksp, MatType mattype, Mat *mat)

Collective

Input Parameters#

  • ksp - the Krylov subspace context

  • mattype - the matrix type to be used

Output Parameter#

  • mat - the explicit 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 for the output operator if mattype == NULL. This routine is costly in general, and is recommended for use only with relatively small systems.

See Also#

KSP: Linear System Solvers, KSP, KSPSetOperators(), KSPComputeEigenvaluesExplicitly(), PCComputeOperator(), KSPSetDiagonalScale(), KSPSetNullSpace(), MatType

Level#

advanced

Location#

src/ksp/ksp/interface/eige.c


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Index of all manual pages