KSPPIPEGCRGetTruncationType#
get the truncation strategy employed by KSPPIPEGCR
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPPIPEGCRGetTruncationType(KSP ksp, KSPFCDTruncationType *truncstrat)
Not Collective
Input Parameter#
ksp - the Krylov space context
Output Parameter#
truncstrat - the strategy type
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,..
Options Database Key#
-ksp_pipegcr_truncation_type <standard,notay> - which stored basis vectors to orthogonalize against
See Also#
KSP: Linear System Solvers, 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