petsc-3.7.7 2017-09-25
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KSPPIPEGCRSetTruncationType

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

Synopsis

#include "petscksp.h"  
PetscErrorCode KSPPIPEGCRSetTruncationType(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)) directions at iteration i=0,1,..

Input Parameters

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

Options Database

-ksp_pipegcr_truncation, -ksp_pipegcr_truncation_restart

See Also

KSPPIPEGCR, KSPPIPEGCRSetTruncationType, KSPPIPEGCRTruncationType, KSPFCDTruncationType

Level:intermediate
Location:src/ksp/ksp/impls/gcr/pipegcr/pipegcr.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages