MatICCFactorSymbolic#

Performs symbolic incomplete Cholesky factorization for a symmetric matrix. Use MatCholeskyFactorNumeric() to complete the factorization.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatICCFactorSymbolic(Mat fact, Mat mat, IS perm, const MatFactorInfo *info)

Collective

Input Parameters#

fact - the factorized matrix obtained with MatGetFactor()
mat - the matrix to be factored
perm - row and column permutation
info - structure containing

      levels - number of levels of fill.
      expected fill - as ratio of original fill.

Notes#

Most users should employ the KSP interface for linear solvers instead of working directly with matrix algebra routines such as this. See, e.g., KSPCreate().

This uses the definition of level of fill as in Y. Saad [Saa03]

Developer Note#

The Fortran interface is not autogenerated as the interface definition cannot be generated correctly [due to MatFactorInfo]

References#

Saa03: Yousef Saad. Iterative Methods for Sparse Linear Systems. SIAM, 2nd edition, 2003. doi:10.1016/S1570-579X(01)80025-2.

Level#

developer

Location#

src/mat/interface/matrix.c

Implementations#

MatICCFactorSymbolic_SeqAIJ() in src/mat/impls/aij/seq/aijfact.c
MatICCFactorSymbolic_SeqAIJCUSPARSE() in src/mat/impls/aij/seq/seqcusparse/aijcusparse.cu
MatICCFactorSymbolic_SeqAIJHIPSPARSE() in src/mat/impls/aij/seq/seqhipsparse/aijhipsparse.hip.c
MatICCFactorSymbolic_SeqBAIJ() in src/mat/impls/baij/seq/baijfact.c
MatICCFactorSymbolic_SeqSBAIJ() in src/mat/impls/sbaij/seq/sbaijfact2.c

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