slepc-3.22.1 2024-10-28
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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  - singular value solver
oneside  - boolean flag indicating if the method is one-sided or not

Options Database Key

-svd_lanczos_oneside <boolean>  - 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

SVDTRLanczosSetOneSide()

Level

advanced

Location

src/svd/impls/lanczos/gklanczos.c

Index of all SVD routines
Table of Contents for all manual pages
Index of all manual pages