PCFactorReorderForNonzeroDiagonal#
reorders rows/columns of matrix to remove zeros from diagonal
Synopsis#
#include "petscpc.h"
PetscErrorCode PCFactorReorderForNonzeroDiagonal(PC pc, PetscReal rtol)
Logically Collective
Input Parameters#
pc - the preconditioner context
rtol - diagonal entries smaller than this in absolute value are considered zero
Options Database Key#
-pc_factor_nonzeros_along_diagonal
- perform the reordering with the given tolerance
See Also#
KSP: Linear System Solvers, PCILU, PCICC, PCFactorSetFill(), PCFactorSetShiftNonzero(), PCFactorSetZeroPivot(), MatReorderForNonzeroDiagonal()
Level#
intermediate
Location#
Implementations#
PCFactorReorderForNonzeroDiagonal_ILU() in src/ksp/pc/impls/factor/ilu/ilu.c
PCFactorReorderForNonzeroDiagonal_LU() in src/ksp/pc/impls/factor/lu/lu.c
Index of all PC routines
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Index of all manual pages