petsc-3.12.4 2020-02-04
Report Typos and Errors

# PCDeflationSetReductionFactor

Set reduction factor for the bottom PCTELESCOPE coarse problem solver.

### Synopsis

    #include "petscksp.h"
    PetscErrorCode PCDeflationSetReductionFactor(PC pc,PetscInt red)

Logically Collective

### Input Parameters

| pc | - the preconditioner context
| red | - reduction factor (or PETSC_DETERMINE)

### Options Database Keys

-pc_deflation_reduction_factor <-1> -reduction factor on bottom level coarse problem for PCTELESCOPE

### Notes

Default is computed based on the size of the coarse problem.

### See Also

PCTELESCOPE, PCDEFLATION

### Level

intermediate

### Location

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

### Implementations

PCDeflationSetReductionFactor_Deflation in src/ksp/pc/impls/deflation/deflation.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages