DMMGSetNullSpace

 Indicates the null space in the linear operator (this is needed by the linear solver)

Synopsis

#include "petscda.h"   
#include "petscksp.h"  
#include "petscmg.h"   
#include "petscdmmg.h" 
#include "petscpc.h"   
PetscErrorCode PETSCSNES_DLLEXPORT DMMGSetNullSpace(DMMG *dmmg,PetscTruth has_cnst,PetscInt n,PetscErrorCode (*func)(DMMG,Vec[]))
Collective on DMMG

Input Parameter

dmmg - the context
has_cnst - is the constant vector in the null space
n - number of null vectors (excluding the possible constant vector)
func - a function that fills an array of vectors with the null vectors (must be orthonormal), may be PETSC_NULL

See Also

DMMGCreate(), DMMGDestroy, DMMGSetDM(), DMMGSolve(), MatNullSpaceCreate(), KSPSetNullSpace(), DMMGSetUseGalerkin(), DMMGSetMatType()

Level:advanced
Location:src/snes/utils/damg.c
Index of all DA routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ksp/ksp/examples/tutorials/ex29.c.html
src/ksp/ksp/examples/tutorials/ex32.c.html
src/ksp/ksp/examples/tutorials/ex33.c.html
src/ksp/ksp/examples/tutorials/ex34.c.html
src/snes/examples/tutorials/ex29.c.html