PCPFLAREINVSetSparsityOrder

Sets the sparsity order used when PCPFLAREINV assembles its approximate inverse

Synopsis

PetscErrorCode PCPFLAREINVSetSparsityOrder(PC pc, PetscInt inverse_sparsity_order)

Logically Collective

Input Parameters

• pc - the PCPFLAREINV preconditioner context

• inverse_sparsity_order - the power of the input matrix used as the sparsity pattern of the assembled inverse

Options Database Key

• -pc_pflareinv_sparsity_order inverse_sparsity_order - power of the input matrix used as the sparsity pattern in assembled inverses; defaults to 1

Note

The assembled approximate inverse uses this power of the input matrix as its nonzero pattern, so a larger value gives a denser and typically more accurate inverse at higher setup and apply cost. It has no effect when the inverse is applied matrix-free (see PCPFLAREINVSetMatrixFree()).

See Also

KSP: Linear System Solvers, PCPFLAREINV, PCPFLAREINVGetSparsityOrder(), PCPFLAREINVSetMatrixFree()

Level

advanced

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