NEPSetTwoSided#

Sets the solver to use a two-sided variant so that left eigenvectors are also computed.

Synopsis#

#include "slepcnep.h" 
PetscErrorCode NEPSetTwoSided(NEP nep,PetscBool twosided)

Logically Collective

Input Parameters#

  • nep - the eigensolver context

  • twosided - whether the two-sided variant is to be used or not

Options Database Keys#

  • -nep_two_sided - Sets/resets the twosided flag

Notes#

If the user sets twosided=PETSC_TRUE then the solver uses a variant of the algorithm that computes both right and left eigenvectors. This is usually much more costly. This option is not available in all solvers.

When using two-sided solvers, the problem matrices must have both the MatMult and MatMultTranspose operations defined.

See Also#

NEPGetTwoSided(), NEPGetLeftEigenvector()

Level#

advanced

Location#

src/nep/interface/nepopts.c

Examples#

src/nep/tutorials/ex42.c

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