petsc-3.9.4 2018-09-11
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MatNullSpaceTest

Tests if the claimed null space is really a null space of a matrix

Synopsis

#include "petscmat.h" 
PetscErrorCode  MatNullSpaceTest(MatNullSpace sp,Mat mat,PetscBool  *isNull)
Collective on MatNullSpace

Input Parameters

sp - the null space context
mat - the matrix

Output Parameters

isNull -PETSC_TRUE if the nullspace is valid for this matrix

Keywords

PC, null space, remove

See Also

MatNullSpaceCreate(), MatNullSpaceDestroy(), MatNullSpaceSetFunction()

Level

advanced

Location

src/mat/interface/matnull.c

Examples

src/snes/examples/tutorials/ex62.c.html
src/ts/examples/tutorials/ex50.c.html
src/tao/unconstrained/examples/tutorials/spectraladjointassimilation.c.html

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