EPSKrylovSchurSetDetectZeros#
Sets a flag to enforce detection of zeros during the factorizations throughout the spectrum slicing computation.
Synopsis#
#include "slepceps.h"
PetscErrorCode EPSKrylovSchurSetDetectZeros(EPS eps,PetscBool detect)
Logically Collective
Input Parameters#
eps - the eigenproblem solver context
detect - check for zeros
Options Database Key#
-eps_krylovschur_detect_zeros - Check for zeros; this takes an optional bool value (0/1/no/yes/true/false)
Notes#
A zero in the factorization indicates that a shift coincides with an eigenvalue.
This flag is turned off by default, and may be necessary in some cases, especially when several partitions are being used. This feature currently requires an external package for factorizations with support for zero detection, e.g. MUMPS.
See Also#
EPSKrylovSchurSetPartitions(), EPSSetInterval()
Level#
advanced
Location#
Examples#
Implementations#
EPSKrylovSchurSetDetectZeros_KrylovSchur() in src/eps/impls/krylov/krylovschur/krylovschur.c
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