KSPFCGSetTruncationType#

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

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 orthogonalization

See Also#

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

Level#

intermediate

Location#

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

Index of all KSP routines
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Index of all manual pages