petsc-3.10.5 2019-03-28
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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
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Index of all manual pages