PCSPAISetNBSteps#
set maximum number of improvement steps per row in the PCSPAI preconditioner
Synopsis#
#include "petscpc.h"
PetscErrorCode PCSPAISetNBSteps(PC pc, PetscInt nbsteps1)
Input Parameters#
pc - the preconditioner
nbsteps1 - number of steps (default 5)
Note#
PCSPAI constructs to approximation to every column of
the exact inverse of A in a series of improvement
steps. The quality of the approximation is determined
by epsilon. If an approximation achieving an accuracy
of epsilon is not obtained after nbsteps1 steps, PCSPAI simply
uses the best approximation constructed so far.
See Also#
KSP: Linear System Solvers, PCSPAI, PCSetType(), PCSPAISetMaxNew()
Level#
intermediate
Location#
Implementations#
PCSPAISetNBSteps_SPAI() in src/ksp/pc/impls/spai/ispai.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages