PETSc version 3.17.4
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# PCDeflationSetProjectionNullSpaceMat

Set the projection null space matrix (W'*A).

### Synopsis

    #include "petscksp.h"
    PetscErrorCode  PCDeflationSetProjectionNullSpaceMat(PC pc,Mat mat)

Collective

### Input Parameters

| pc | - preconditioner context
| mat | - projection null space matrix

### See Also

PCDEFLATION

### Level

developer

### Location

src/ksp/pc/impls/deflation/deflation.c

### Implementations

PCDeflationSetProjectionNullSpaceMat_Deflation in src/ksp/pc/impls/deflation/deflation.c
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