petsc-3.10.5 2019-03-28
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# 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

### See Also

KSP, KSPCG

### 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