petsc-3.4.5 2014-06-29

KSPGetOperators

Gets the matrix associated with the linear system and a (possibly) different one associated with the preconditioner.

#include "petscksp.h" 
PetscErrorCode  KSPGetOperators(KSP ksp,Mat *Amat,Mat *Pmat,MatStructure *flag)

Collective on KSP and Mat

ksp -the KSP context

	Amat	- the matrix that defines the linear system
	Pmat	- the matrix to be used in constructing the preconditioner, usually the same as Amat.
	flag	- flag indicating information about the preconditioner matrix structure during successive linear solves. This flag is ignored the first time a linear system is solved, and thus is irrelevant when solving just one linear system.

Notes: DOES NOT increase the reference counts of the matrix, so you should NOT destroy them.

KSP, set, get, operators, matrix, preconditioner, linear system