petsc-3.6.2 2015-10-02
   
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/ex10.c.html
src/ksp/ksp/examples/tutorials/ex49.c.html
src/ksp/ksp/examples/tutorials/ex56.c.html