petsc-3.14.6 2021-03-30
MatLUFactor
Performs in-place LU factorization of matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatLUFactor(Mat mat,IS row,IS col,const MatFactorInfo *info)
Collective on Mat
Input Parameters
| mat | - the matrix
|
| row | - row permutation
|
| col | - column permutation
|
| info | - options for factorization, includes
|
fill - expected fill as ratio of original fill.
dtcol - pivot tolerance (0 no pivot, 1 full column pivoting)
Run with the option -info to determine an optimal value to use
Notes
Most users should employ the simplified KSP interface for linear solvers
instead of working directly with matrix algebra routines such as this.
See, e.g., KSPCreate().
This changes the state of the matrix to a factored matrix; it cannot be used
for example with MatSetValues() unless one first calls MatSetUnfactored().
See Also
MatLUFactorSymbolic(), MatLUFactorNumeric(), MatCholeskyFactor(),
MatGetOrdering(), MatSetUnfactored(), MatFactorInfo, MatGetFactor()
Developer Note: fortran interface is not autogenerated as the f90
interface defintion cannot be generated correctly [due to MatFactorInfo]
Level
developer
Location
src/mat/interface/matrix.c
Examples
src/ksp/ksp/tutorials/ex74.c.html
Implementations
MatLUFactor_SeqAIJ in src/mat/impls/aij/seq/aijfact.c
MatLUFactor_SeqBAIJ in src/mat/impls/baij/seq/baijfact.c
MatLUFactor_SeqDenseCUDA in src/mat/impls/dense/seq/cuda/densecuda.cu
MatLUFactor_SeqDense in src/mat/impls/dense/seq/dense.c
MatLUFactor_Elemental in src/mat/impls/elemental/matelem.cxx
MatLUFactor_ScaLAPACK in src/mat/impls/scalapack/matscalapack.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages