EPSComputeResidualNorm

Computes the norm of the residual vector associated with the i-th computed eigenpair.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSComputeResidualNorm(EPS eps, PetscInt i, PetscReal *norm)
Collective on EPS

Input Parameter

eps - the eigensolver context
i - the solution index

Output Parameter

norm - the residual norm, computed as ||Ax-kBx||_2 where k is the eigenvalue and x is the eigenvector. If k=0 then the residual norm is computed as ||Ax||_2.

Notes

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

EPSSolve(), EPSGetConverged(), EPSSetWhichEigenpairs()

Location: src/eps/interface/solve.c
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages