petsc-3.5.4 2015-05-23
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MatMFFDAddNullSpace

 Provides a null space that an operator is supposed to have. Since roundoff will create a small component in the null space, if you know the null space you may have it automatically removed.

Synopsis

#include "petscmat.h"   
PetscErrorCode  MatMFFDAddNullSpace(Mat J,MatNullSpace nullsp)
Logically Collective on Mat

Input Parameters

J - the matrix-free matrix context
nullsp - object created with MatNullSpaceCreate()

Keywords

SNES, matrix-free, null space

See Also

MatNullSpaceCreate(), MatMFFDGetH(), MatCreateSNESMF(), MatCreateMFFD(), MATMFFD
MatMFFDSetHHistory(), MatMFFDResetHHistory()

Level:advanced
Location:src/mat/impls/mffd/mffd.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages