NEPRIISetDeflationThreshold#
Sets the threshold value used to switch between deflated and non-deflated iteration.
Synopsis#
#include "slepcnep.h"
PetscErrorCode NEPRIISetDeflationThreshold(NEP nep,PetscReal deftol)
Logically Collective
Input Parameters#
nep - nonlinear eigenvalue solver
deftol - the threshold value
Options Database Keys#
-nep_rii_deflation_threshold
- set the threshold
Notes#
Normally, the solver iterates on the extended problem in order to deflate previously converged eigenpairs. If this threshold is set to a nonzero value, then once the residual error is below this threshold the solver will continue the iteration without deflation. The intention is to be able to improve the current eigenpair further, despite having previous eigenpairs with somewhat bad precision.
See Also#
NEPRIIGetDeflationThreshold()
Level#
advanced
Location#
Implementations#
NEPRIISetDeflationThreshold_RII() in src/nep/impls/rii/rii.c
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