petsc-master 2015-07-31
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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

You can remove the null space by calling this routine with an nullsp of NULL

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/ex10.c.html
src/ksp/ksp/examples/tutorials/ex49.c.html
src/ksp/ksp/examples/tutorials/ex56.c.html