EPSSetTwoSided#

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

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSSetTwoSided(EPS eps,PetscBool twosided)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

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

Options Database Key#

  • -eps_two_sided - toggles 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, see table Supported problem types for all eigensolvers available in SLEPc.

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

See Also#

EPS: Eigenvalue Problem Solver, EPSGetTwoSided(), EPSGetLeftEigenvector()

Level#

advanced

Location#

src/eps/interface/epsopts.c

Examples#

src/eps/tutorials/ex41.c

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