PCFactorSetColumnPivot#
Determines when column pivoting is done during matrix factorization. For PETSc dense matrices column pivoting is always done, for PETSc sparse matrices it is never done. For the MATLAB and MATSOLVERSUPERLU
factorization this is used.
Synopsis#
#include "petscpc.h"
PetscErrorCode PCFactorSetColumnPivot(PC pc, PetscReal dtcol)
Logically Collective
Input Parameters#
pc - the preconditioner context
dtcol - 0.0 implies no pivoting, 1.0 complete pivoting (slower, requires more memory but more stable)
Options Database Key#
-pc_factor_pivoting
- perform the pivoting with the given tolerance
See Also#
KSP: Linear System Solvers, PCLU
, PCCHOLESKY
, PCILU
, PCICC
, PCILUSetMatOrdering()
, PCFactorSetPivotInBlocks()
Level#
intermediate
Location#
Implementations#
PCFactorSetColumnPivot_Factor() in src/ksp/pc/impls/factor/factimpl.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages