petsc-3.9.4 2018-09-11
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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 SuperLU factorization this is used.
Synopsis
#include "petscpc.h"
PetscErrorCode
PCFactorSetColumnPivot
(
PC
pc,
PetscReal
dtcol)
Logically Collective on
PC
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 <dtcol>
-
See Also
PCILUSetMatOrdering(),
PCFactorSetPivotInBlocks
()
Level
intermediate
Location
src/ksp/pc/impls/factor/factor.c
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