# NEPComputeRelativeError

Computes the relative error bound associated with the i-th computed eigenpair.

### Synopsis

    #include "slepcnep.h"
    PetscErrorCode NEPComputeRelativeError(NEP nep,PetscInt i,PetscReal *error)

Collective on NEP

### Input Parameter

| nep | - the nonlinear eigensolver context
| i | - the solution index

### Output Parameter

error - the relative error bound, computed as ||T(lambda)x||_2/||lambda*x||_2 where lambda is the eigenvalue and x is the eigenvector. If lambda=0 the relative error is computed as ||T(lambda)x||_2/||x||_2.

### See Also

NEPSolve(), NEPComputeResidualNorm(), NEPGetErrorEstimate()

Location: src/nep/interface/nepsolve.c
Index of all NEP routines
Table of Contents for all manual pages
Index of all manual pages

### Examples

src/nep/examples/tutorials/ex20.c.html
src/nep/examples/tutorials/ex21.c.html
src/nep/examples/tutorials/ex22.c.html