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
n - 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 ns steps, SPAI simply uses the best approximation constructed so far.