PEPSTOARSetDetectZeros#

Sets a flag to enforce detection of zeros during the factorizations throughout the spectrum slicing computation.

Synopsis#

#include "slepcpep.h" 
PetscErrorCode PEPSTOARSetDetectZeros(PEP pep,PetscBool detect)

Logically Collective

Input Parameters#

  • pep - the polynomial eigensolver context

  • detect - check for zeros

Options Database Key#

  • -pep_stoar_detect_zeros - toggle the zero detection

Notes#

This flag makes sense only for spectrum slicing runs, that is, when an interval has been given with PEPSetInterval() and STSINVERT is set. See more details in section Spectrum Slicing for PEP.

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. This feature currently requires an external package for factorizations with support for zero detection, e.g. MUMPS.

See Also#

PEP: Polynomial Eigenvalue Problems, Spectrum Slicing for PEP, PEPSTOAR, PEPSetInterval()

Level#

advanced

Location#

src/pep/impls/krylov/stoar/stoar.c

Examples#

src/pep/tutorials/ex38.c

Implementations#

PEPSTOARSetDetectZeros_STOAR() in src/pep/impls/krylov/stoar/stoar.c

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