KSPFCGSetTruncationType#

specify how many of its stored previous directions KSPFCG uses during orthoganalization

Synopsis#

#include "petscksp.h"  
PetscErrorCode KSPFCGSetTruncationType(KSP ksp, KSPFCDTruncationType truncstrat)

Logically Collective

Input Parameters#

ksp - the Krylov space context
truncstrat - the choice of strategy

  KSP_FCD_TRUNC_TYPE_STANDARD uses all (up to mmax) stored directions
  KSP_FCD_TRUNC_TYPE_NOTAY uses the last max(1,mod(i,mmax)) stored directions at iteration i=0,1,..

Options Database Key#

-ksp_fcg_truncation_type <standard, notay> - specify how many of its stored previous directions KSPFCG uses during orthoganalization

See Also#

KSP: Linear System Solvers, KSPFCDTruncationType, KSPFCGGetTruncationType, KSPFCGSetNprealloc(), KSPFCGSetMmax(), KSPFCGGetMmax()

Level#

intermediate

Location#

src/ksp/ksp/impls/fcg/fcg.c

Index of all KSP routines
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Index of all manual pages