petsc-master 2014-12-27
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MatNullSpaceGetVecs

get vectors defining the null space

Synopsis

#include "petscmat.h" 
PetscErrorCode MatNullSpaceGetVecs(MatNullSpace sp,PetscBool *has_const,PetscInt *n,const Vec **vecs)
Not Collective

Input Arguments

sp -null space object

Output Arguments

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)

Notes

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

See Also

MatNullSpaceCreate(), MatGetNullSpace(), MatGetNearNullSpace()

Level:developer
Location:
src/mat/interface/matnull.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ksp/ksp/examples/tutorials/ex49.c.html