petsc-3.6.2 2015-10-02
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# KSPSetUseFischerGuess

Use the Paul Fischer algorithm, see KSPFischerGuessCreate()

### Synopsis

    #include "petscksp.h"
    PetscErrorCode  KSPSetUseFischerGuess(KSP ksp,PetscInt model,PetscInt size)

Logically Collective on KSP

### Input Parameters

| ksp | - the Krylov context
| model | - use model 1, model 2 or 0 to turn it off
| size | - size of subspace used to generate initial guess

### Options Database

-ksp_fischer_guess <model,size> -uses the Fischer initial guess generator for repeated linear solves

### Keywords

KSP, set, options, prefix, database

### See Also

KSPSetOptionsPrefix(), KSPAppendOptionsPrefix(), KSPSetUseFischerGuess(), KSPSetFischerGuess(), KSPGetFischerInitialGuess()

Level:advanced
Location: src/ksp/ksp/interface/itcl.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages