EPSSetExtraction#

Specifies the type of extraction technique to be employed by the eigensolver.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSSetExtraction(EPS eps,EPSExtraction extr)

Logically Collective

Input Parameters#

  • eps - the eigensolver context

  • extr - a known type of extraction

Options Database Keys#

  • -eps_ritz - Rayleigh-Ritz extraction

  • -eps_harmonic - harmonic Ritz extraction

  • -eps_harmonic_relative - harmonic Ritz extraction relative to the eigenvalue

  • -eps_harmonic_right - harmonic Ritz extraction for rightmost eigenvalues

  • -eps_harmonic_largest - harmonic Ritz extraction for largest magnitude (without target)

  • -eps_refined - refined Ritz extraction

  • -eps_refined_harmonic - refined harmonic Ritz extraction

Notes#

Not all eigensolvers support all types of extraction. See the SLEPc Users Manual for details.

By default, a standard Rayleigh-Ritz extraction is used. Other extractions may be useful when computing interior eigenvalues.

Harmonic-type extractions are used in combination with a ‘target’.

See Also#

EPSSetTarget(), EPSGetExtraction(), EPSExtraction

Level#

advanced

Location#

src/eps/interface/epsopts.c

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