petsc-3.3-p7 2013-05-11
MatSetNearNullSpace
attaches a null space to a matrix. This null space will be used to provide near null space vectors to a multigrid preconditioner built from this matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatSetNearNullSpace(Mat mat,MatNullSpace nullsp)
Logically Collective on Mat and MatNullSpace
Input Parameters
| mat | - the matrix
|
| nullsp | - the null space object
|
Notes
Overwrites any previous near null space that may have been attached
See Also
MatCreate(), MatNullSpaceCreate(), MatSetNullSpace()
Level:advanced
Location:src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages
Examples
src/ksp/ksp/examples/tutorials/ex49.c.html