petsc-master 2014-09-17
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MatSetNullSpace

attaches a null space to a matrix. This null space will be removed from the resulting vector whenever MatMult() is called

Synopsis

#include "petscmat.h" 
PetscErrorCode  MatSetNullSpace(Mat mat,MatNullSpace nullsp)
Logically Collective on Mat and MatNullSpace

Input Parameters

mat - the matrix
nullsp - the null space object

Notes

This null space is used by solvers. Overwrites any previous null space that may have been attached

See Also

MatCreate(), MatNullSpaceCreate(), MatSetNearNullSpace()

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/ex29.c.html
src/ksp/ksp/examples/tutorials/ex32.c.html
src/ksp/ksp/examples/tutorials/ex34.c.html
src/ksp/ksp/examples/tutorials/ex50.c.html
src/snes/examples/tutorials/ex7.c.html
src/snes/examples/tutorials/ex12.c.html
src/snes/examples/tutorials/ex62.c.html