SVDLanczosSetOneSide#

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

Synopsis#

#include "slepcsvd.h" 
PetscErrorCode SVDLanczosSetOneSide(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_lanczos_oneside - Indicates the boolean flag

Note#

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. It also saves the memory required for storing such vectors.

See Also#

SVD: Singular Value Decomposition, SVDTRLanczosSetOneSide()

Level#

advanced

Location#

src/svd/impls/lanczos/gklanczos.c

Implementations#

SVDLanczosSetOneSide_Lanczos() in src/svd/impls/lanczos/gklanczos.c

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