PCLUSetPivoting

 Determines when pivoting is done during LU. 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" 
int PCLUSetPivoting(PC pc,PetscReal dtcol)
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_lu_pivoting -dttol

See Also

PCILUSetMatOrdering(), PCLUSetPivotInBlocks()

Level:intermediate
Location:src/sles/pc/impls/lu/lu.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages