KSPGetOperators#
Gets the matrix associated with the linear system and a (possibly) different one used to construct the preconditioner from the KSP context
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPGetOperators(KSP ksp, Mat *Amat, Mat *Pmat)
Collective
Input Parameter#
ksp - the
KSPcontext
Output Parameters#
Amat - the matrix that defines the linear system
Pmat - the matrix to be used in constructing the preconditioner, usually the same as
Amat.
Notes#
If KSPSetOperators() has not been called then the KSP object will attempt to automatically create the matrix Amat and return it
Use KSPGetOperatorsSet() to determine if matrices have been provided.
DOES NOT increase the reference counts of the matrix, so you should NOT destroy them.
See Also#
KSP: Linear System Solvers, KSP, KSPSolve(), KSPGetPC(), PCSetOperators(), KSPSetOperators(), KSPGetOperatorsSet()
Level#
intermediate
Location#
Examples#
src/ksp/ksp/tutorials/ex34.c
src/ksp/ksp/tutorials/ex27.c
src/ksp/ksp/tutorials/ex45.c
src/ksp/ksp/tutorials/ex25.c
src/ksp/ksp/tutorials/ex42.c
src/ksp/ksp/tutorials/ex59.c
src/ksp/ksp/tutorials/ex56.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages