PETSc version 3.17.4
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# PCDeflationSetInitOnly

Do only initialization step. Sets initial guess to the solution on the deflation space but does not apply the deflation preconditioner. The additional preconditioner is still applied.

### Synopsis

    #include "petscksp.h"
    PetscErrorCode PCDeflationSetInitOnly(PC pc,PetscBool flg)

Logically Collective

### Input Parameters

| pc | - the preconditioner context
| flg | - default PETSC_FALSE

### Options Database Keys

| -pc_deflation_init_only <false> | - if true computes only the special guess

### See Also

PCDEFLATION

### Level

intermediate

### Location

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

### Implementations

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