petsc-3.5.0 2014-06-30
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PCFactorSetMatOrderingType

Sets the ordering routine (to reduce fill) to be used in the LU factorization.

Synopsis

#include "petscpc.h" 
PetscErrorCode  PCFactorSetMatOrderingType(PC pc,MatOrderingType ordering)
Logically Collective on PC

Input Parameters

pc - the preconditioner context
ordering - the matrix ordering name, for example, MATORDERINGND or MATORDERINGRCM

Options Database Key

-pc_factor_mat_ordering_type <nd,rcm,...> -Sets ordering routine

Notes: nested dissection is used by default

For Cholesky and ICC and the SBAIJ format reorderings are not available, since only the upper triangular part of the matrix is stored. You can use the SeqAIJ format in this case to get reorderings.

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