# MatILUFactor

Performs in-place ILU factorization of matrix.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode PETSCMAT_DLLEXPORT MatILUFactor(Mat mat,IS row,IS col,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

Level:developer
Location:src/mat/interface/matrix.c
Index of all Mat routines
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