MatNullSpaceGetVecs

get the vectors defining the null space

Synopsis

#include "petscmat.h" 
PetscErrorCode MatNullSpaceGetVecs(MatNullSpace sp, PetscBool *has_const, PetscInt *n, const Vec *vecs[])

Not Collective

Input Parameter

• sp - null space object

Output Parameters

• has_const - PETSC_TRUE if the null space contains the constant vector, otherwise PETSC_FALSE

• n - number of vectors (excluding constant vector) in the null space

• vecs - returns array of length n containing the orthonormal vectors that span the null space (excluding the constant vector), NULL if n is 0

Note

These vectors and the array are owned by the MatNullSpace and should not be destroyed or freeded by the caller

Fortran Note

One must pass in an array vecs that is large enough to hold all of the requested vectors

See Also

Matrices, Mat, MatNullSpace, MatNullSpaceCreate(), MatGetNullSpace(), MatGetNearNullSpace()

Level

developer

Location

src/mat/interface/matnull.c

Examples

src/ksp/ksp/tutorials/ex49.c
src/snes/tutorials/ex69.c

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