KSPFCGSetTruncationType#

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

Synopsis#

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

Logically Collective on ksp

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,..

Input Parameters#

  • ksp - the Krylov space context

  • truncstrat - the choice of strategy

Options Database#

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

.seealso: KSPFCDTruncationType, KSPFCGGetTruncationType

Level#

intermediate

Location#

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


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