PEPGetScale#

Gets the scaling strategy used by the PEP object, and the associated parameters.

Synopsis#

#include "slepcpep.h" 
PetscErrorCode PEPGetScale(PEP pep,PEPScale *scale,PetscReal *alpha,Vec *Dl,Vec *Dr,PetscInt *its,PetscReal *lambda)

Not Collective

Input Parameter#

  • pep - the polynomial eigensolver context

Output Parameters#

  • scale - scaling strategy

  • alpha - the scaling factor used in the scalar strategy

  • Dl - the left diagonal matrix of the diagonal scaling algorithm

  • Dr - the right diagonal matrix of the diagonal scaling algorithm

  • its - number of iterations of the diagonal scaling algorithm

  • lambda - approximation to wanted eigenvalues (modulus)

Note#

The user can specify NULL for any parameter that is not needed.

If Dl or Dr were not set by the user, then the ones computed internally are returned (or a null pointer if called before PEPSetUp).

See Also#

PEP: Polynomial Eigenvalue Problems, PEPSetScale(), PEPSetUp()

Level#

intermediate

Location#

src/pep/interface/pepopts.c

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