EPSGetEigenvalue#

Gets the i-th eigenvalue as computed by EPSSolve().

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSGetEigenvalue(EPS eps,PetscInt i,PetscScalar *eigr,PetscScalar *eigi)

Not Collective

Input Parameters#

  • eps - the linear eigensolver context

  • i - index of the solution

Output Parameters#

  • eigr - real part of eigenvalue

  • eigi - imaginary part of eigenvalue

Notes#

If the eigenvalue is real, then eigi is set to zero. If PETSc is configured with complex scalars the eigenvalue is stored directly in eigr (eigi is set to zero).

The index i should be a value between 0 and nconv-1 (see EPSGetConverged()). Eigenpairs are indexed according to the ordering criterion established with EPSSetWhichEigenpairs().

See Also#

EPS: Eigenvalue Problem Solver, EPSSolve(), EPSGetConverged(), EPSSetWhichEigenpairs(), EPSGetEigenpair()

Level#

beginner

Location#

src/eps/interface/epssolve.c

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