PEPComputeError#

Computes the error (based on the residual norm) associated with the i-th computed eigenpair.

Synopsis#

#include "slepcpep.h" 
PetscErrorCode PEPComputeError(PEP pep,PetscInt i,PEPErrorType type,PetscReal *error)

Collective

Input Parameters#

  • pep - the polynomial eigensolver context

  • i - the solution index

  • type - the type of error to compute

Output Parameter#

  • error - the error

Notes#

The error can be computed in various ways, all of them based on the residual norm ||P(l)x||_2 where l is the eigenvalue and x is the eigenvector. See the users guide for additional details.

See Also#

PEP: Polynomial Eigenvalue Problems, PEPErrorType, PEPSolve(), PEPGetErrorEstimate()

Level#

beginner

Location#

src/pep/interface/pepsolve.c

Examples#

src/pep/tutorials/ex16.c

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