PETSc version 3.17.4
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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

### See Also

MatNullSpaceCreate(), MatNullSpaceDestroy(), MatNullSpaceSetFunction()

### Level

advanced

### Location

src/mat/interface/matnull.c

### Examples

src/ts/tutorials/ex50.c.html
src/tao/unconstrained/tutorials/spectraladjointassimilation.c.html
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