PCAIRSetDiagScalePolys

Sets whether PCAIR diagonally scales before computing a polynomial approximate inverse

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetDiagScalePolys(PC pc, PetscBool input_bool)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_bool - PETSC_TRUE to diagonally scale before computing a polynomial inverse

Options Database Key

• -pc_air_diag_scale_polys (true|false) - diagonally scale before computing a polynomial inverse; defaults to false

Note

Only relevant if using a polynomial inverse type (see PCAIRSetInverseType()); if the inverse type is PFLAREINV_NEUMANN this is always forced true and cannot be overridden. This parameter can be important if the underlying matrix is poorly scaled, as it can improve the accuracy of the polynomial inverse and hence convergence. See also the equivalent for the coarse grid matrix, PCAIRSetCoarsestDiagScalePolys().

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetDiagScalePolys(), PCAIRSetInverseType(), PCAIRSetMatrixFreePolys()

Level

advanced

Index of all PC routines
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Index of all manual pages