PCFieldSplitSchurFactType#

determines which off-diagonal parts of the approximate block factorization to use

Synopsis#

typedef enum {
  PC_FIELDSPLIT_SCHUR_FACT_DIAG,
  PC_FIELDSPLIT_SCHUR_FACT_LOWER,
  PC_FIELDSPLIT_SCHUR_FACT_UPPER,
  PC_FIELDSPLIT_SCHUR_FACT_FULL
} PCFieldSplitSchurFactType;

Values#

PC_FIELDSPLIT_SCHUR_FACT_DIAG - the preconditioner is solving D
PC_FIELDSPLIT_SCHUR_FACT_LOWER - the preconditioner is solving L D
PC_FIELDSPLIT_SCHUR_FACT_UPPER - the preconditioner is solving D U
PC_FIELDSPLIT_SCHUR_FACT_FULL - the preconditioner is solving L(D U)

where the matrix is factorized as

   (A   B)  = (1       0) (A   0) (1  Ainv*B)  = L D U
   (C   E)    (C*Ainv  1) (0   S) (0       1)

See Also#

Preconditioners, PCFIELDSPLIT, PCFieldSplitSetSchurFactType(), PC

Level#

intermediate

Location#

include/petscpctypes.h

Examples#

src/dm/impls/stag/tutorials/ex4.c

Index of all PC routines
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Index of all manual pages