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

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

  • vecs - orthonormal vectors that span the null space (excluding the constant vector)

Note#

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

See Also#

MatNullSpace, MatNullSpaceCreate(), MatGetNullSpace(), MatGetNearNullSpace()

Level#

developer

Location#

src/mat/interface/matnull.c

Examples#

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


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