petsc-master 2014-12-17
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PCCompositeType

Determines how two or more preconditioner are composed

Synopsis

typedef enum {PC_COMPOSITE_ADDITIVE,PC_COMPOSITE_MULTIPLICATIVE,PC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE,PC_COMPOSITE_SPECIAL,PC_COMPOSITE_SCHUR} PCCompositeType;
 PC_COMPOSITE_ADDITIVE - results from application of all preconditioners are added together
 PC_COMPOSITE_MULTIPLICATIVE - preconditioners are applied sequentially to the residual freshly
                               computed after the previous preconditioner application
 PC_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 preconditions)
 PC_COMPOSITE_SPECIAL - This is very special for a matrix of the form alpha I + R + S
                        where first preconditioner is built from alpha I + S and second from
                        alpha I + R

See Also

PCCompositeSetType()

Level:beginner
Location:
src/ksp/pc/../../../include/petscpc.h
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages