petsc-3.8.4 2018-03-24

KSPFCGSetTruncationType

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

#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,..

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

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