PCAIRSetSymmetric

Sets whether PCAIR defines the prolongator as the transpose of the restrictor

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetSymmetric(PC pc, PetscBool input_bool)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_bool - PETSC_TRUE to use symmetric grid-transfer operators, defining the prolongator as R^T

Options Database Key

• -pc_air_symmetric (true|false) - define the prolongator as R^T, giving symmetric grid-transfer operators; defaults to false

Note

Defining the prolongator as R^T gives symmetric grid-transfer operators, appropriate for symmetric problems and needed if the overall preconditioner must be symmetric, for example when used with CG. For nonsymmetric problems the default prolongator is usually better.

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetSymmetric(), PCAIRSetOnePointClassicalProlong()

Level

advanced

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Index of all manual pages