EPSComputeResidualNorm

Computes the residual norm associated with the i-th converged approximate eigenpair.

Synopsis

#include "slepceps.h" 
int EPSComputeResidualNorm(EPS eps, int 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|| where k is the eigenvalue and x is the eigenvector. If k=0 then the residual norm is computed as ||Ax||.

Notes

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

See Also

EPSSolve(), EPSGetConverged(), EPSSetWhichEigenpairs()

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