PCCompositeType#
Determines how two or more preconditioner are composed with the PCType
of PCCOMPOSITE
Synopsis#
Values#
PC_COMPOSITE_ADDITIVE
- results from application of all preconditioners are added togetherPC_COMPOSITE_MULTIPLICATIVE
- preconditioners are applied sequentially to the residual freshly computed after the previous preconditioner applicationPC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE
- preconditioners are applied sequentially to the residual freshly computed from first preconditioner to last and then back (Use only for symmetric matrices and preconditioners)PC_COMPOSITE_SPECIAL
- This is very special for a matrix of the form \( \alpha I + R + S\) where the first preconditioner is built from \(\alpha I + S\) and second from \(\alpha I + R\)PC_COMPOSITE_SCHUR
- composes the Schur complement of the matrix from two blocks, seePCFIELDSPLIT
PC_COMPOSITE_GKB
- the generalized Golub-Kahan bidiagonalization preconditioner, seePCFIELDSPLIT
See Also#
Preconditioners, PCCOMPOSITE
, PCFIELDSPLIT
, PC
, PCCompositeSetType()
, SNESCompositeType
, PCCompositeSpecialSetAlpha()
Level#
beginner
Location#
Examples#
Examples#
Examples#
Examples#
src/ksp/ksp/tutorials/ex87.c
src/dm/impls/stag/tutorials/ex4.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages