petsc-3.7.1 2016-05-15
Report Typos and Errors

MatILUFactorSymbolic

Performs symbolic ILU factorization of a matrix. Uses levels of fill only, not drop tolerance. Use MatLUFactorNumeric() to complete the factorization.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatILUFactorSymbolic(Mat fact,Mat mat,IS row,IS col,const MatFactorInfo *info)
Collective on Mat Many br

Input Parameters

mat - the matrix Many br
row - row permutation Many br
column - column permutation Many br
info - structure containing Many br
     levels - number of levels of fill.
     expected fill - as ratio of original fill.
     1 or 0 - indicating force fill on diagonal (improves robustness for matrices
missing diagonal entries) Many br

Output Parameters

fact -new matrix that has been symbolically factored Many br

Notes: See Users-Manual: ch_mat for additional information about choosing the fill factor for better efficiency. Many br

Most users should employ the simplified KSP interface for linear solvers Many brinstead of working directly with matrix algebra routines such as this. Many brSee, e.g., KSPCreate(). Many br

Many br

See Also

MatLUFactorSymbolic(), MatLUFactorNumeric(), MatCholeskyFactor()
MatGetOrdering(), MatFactorInfo Many br

Developer Note: fortran interface is not autogenerated as the f90 Many brinterface defintion cannot be generated correctly [due to MatFactorInfo] Many br

Level:developer
Location:
src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages