PCAIRSetStrongRThreshold

Sets the threshold used by PCAIR to drop entries when forming the grid-transfer operators

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetStrongRThreshold(PC pc, PetscReal input_real)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_real - the strong R threshold

Options Database Key

• -pc_air_strong_r_threshold threshold - threshold to drop when forming the grid-transfer operators; defaults to 0.0

Note

This only applies when computing Z; for example, if a GMRES polynomial approximation to Aff^-1 is built, this dropping is applied, Z is computed, and then an Aff^-1 approximation without the dropping is rebuilt for smoothing.

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetStrongRThreshold(), PCAIRSetZType(), PCAIRSetStrongThreshold()

Level

advanced

Index of all PC routines
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Index of all manual pages