PCFieldSplitSetDetectSaddlePoint#
Sets flag indicating whether PCFIELDSPLIT will attempt to automatically determine fields based on zero diagonal entries.
Synopsis#
#include "petscpc.h"
PetscErrorCode PCFieldSplitSetDetectSaddlePoint(PC pc, PetscBool flg)
Logically Collective
Input Parameter#
pc - the preconditioner context
Output Parameter#
flg - boolean indicating whether to detect fields or not
Options Database Key#
-pc_fieldsplit_detect_saddle_point
- detect and use the saddle point
Note#
Also sets the split type to PC_COMPOSITE_SCHUR (see PCFieldSplitSetType()) and the Schur preconditioner type to PC_FIELDSPLIT_SCHUR_PRE_SELF (see PCFieldSplitSetSchurPre()).
See Also#
Solving Block Matrices, PC, PCFIELDSPLIT, PCFieldSplitGetDetectSaddlePoint(), PCFieldSplitSetType(), PCFieldSplitSetSchurPre(), PC_FIELDSPLIT_SCHUR_PRE_SELF
Level#
intermediate
Location#
Examples#
src/dm/impls/stag/tutorials/ex3.c
src/dm/impls/stag/tutorials/ex2.c
Index of all PC routines
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Index of all manual pages