EPSKrylovSchurSetDimensions#

Sets the dimensions used for each subsolve step in case of doing spectrum slicing for a computational interval.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSKrylovSchurSetDimensions(EPS eps,PetscInt nev,PetscInt ncv,PetscInt mpd)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • nev - number of eigenvalues to compute

  • ncv - the maximum dimension of the subspace to be used by the subsolve

  • mpd - the maximum dimension allowed for the projected problem

Options Database Keys#

  • -eps_krylovschur_nev <nev> - sets the number of eigenvalues

  • -eps_krylovschur_ncv <ncv> - sets the dimension of the subspace

  • -eps_krylovschur_mpd <mpd> - sets the maximum projected dimension

Notes#

These parameters are relevant only for spectrum slicing runs, that is, when an interval has been given with EPSSetInterval() and STSINVERT is set. See more details in section Spectrum Slicing.

The meaning of the parameters is the same as in EPSSetDimensions(), but the ones here apply to every subsolve done by the child EPS object.

Use PETSC_DETERMINE for ncv and mpd to assign a default value. For any of the arguments, use PETSC_CURRENT to preserve the current value.

See Also#

EPS: Eigenvalue Problem Solver, Spectrum Slicing, EPSKRYLOVSCHUR, EPSKrylovSchurGetDimensions(), EPSSetDimensions(), EPSSetInterval()

Level#

advanced

Location#

src/eps/impls/krylov/krylovschur/krylovschur.c

Implementations#

EPSKrylovSchurSetDimensions_KrylovSchur() in src/eps/impls/krylov/krylovschur/krylovschur.c

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