SVDTRLanczosSetOneSide#

Indicate if the variant of the Lanczos method to be used is one-sided or two-sided.

Synopsis#

#include "slepcsvd.h" 
PetscErrorCode SVDTRLanczosSetOneSide(SVD svd,PetscBool oneside)

Logically Collective

Input Parameters#

  • svd - the singular value solver context

  • oneside - boolean flag indicating if the method is one-sided or not

Options Database Key#

  • -svd_trlanczos_oneside - Indicates the boolean flag

Notes#

By default, a two-sided variant is selected, which is sometimes slightly more robust. However, the one-sided variant is faster because it avoids the orthogonalization associated to left singular vectors.

One-sided orthogonalization is also available for the GSVD, in which case two orthogonalizations out of three are avoided.

See Also#

SVD: Singular Value Decomposition, SVDLanczosSetOneSide()

Level#

advanced

Location#

src/svd/impls/trlanczos/trlanczos.c

Implementations#

SVDTRLanczosSetOneSide_TRLanczos() in src/svd/impls/trlanczos/trlanczos.c

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