petsc-3.10.5 2019-03-28
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# MatILUFactor

Performs in-place ILU factorization of matrix.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatILUFactor(Mat mat,IS row,IS col,const MatFactorInfo *info)

Collective on Mat

### Input Parameters

| mat | - the matrix
| row | - row permutation
| col | - column permutation
| info | - structure containing

         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)

### Notes

Probably really in-place only when level of fill is zero, otherwise allocates new space to store factored matrix and deletes previous memory.

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().

### See Also

MatILUFactorSymbolic(), MatLUFactorNumeric(), MatCholeskyFactor(), MatFactorInfo

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

### Implementations

MatILUFactor_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatILUFactor_SeqBAIJ in src/mat/impls/baij/seq/baij.c
Index of all Mat routines
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Index of all manual pages