petsc-3.9.4 2018-09-11

KSPCGSetType

Sets the variant of the conjugate gradient method to use for solving a linear system with a complex coefficient matrix. This option is irrelevant when solving a real system.

Synopsis

#include "petscksp.h" 
PetscErrorCode  KSPCGSetType(KSP ksp,KSPCGType type)

Logically Collective on KSP

Input Parameters

	ksp	- the iterative context
	type	- the variant of CG to use, one of

      KSP_CG_HERMITIAN - complex, Hermitian matrix (default)
      KSP_CG_SYMMETRIC - complex, symmetric matrix

Options Database Keys

	-ksp_cg_hermitian	- Indicates Hermitian matrix
	-ksp_cg_symmetric	- Indicates symmetric matrix

Note

By default, the matrix is assumed to be complex, Hermitian.

Keywords

CG, conjugate gradient, Hermitian, symmetric, set, type

Level

intermediate

Location

src/ksp/ksp/impls/cg/cgtype.c

Implementations

KSPCGSetType_CG in src/ksp/ksp/impls/cg/cg.c
KSPCGSetType_CGNE in src/ksp/ksp/impls/cg/cgne/cgne.c

Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages