# EPSComputeRelativeErrorLeft

Computes the relative error bound associated with the i-th computed eigenvalue and left eigenvector (only available in two-sided eigensolvers).

### Synopsis

    #include "slepceps.h"
    PetscErrorCode EPSComputeRelativeErrorLeft(EPS eps,PetscInt i,PetscReal *error)

Collective on EPS

### Input Parameter

| eps | - the eigensolver context
| i | - the solution index

### Output Parameter

error - the relative error bound, computed as ||y'A-ky'B||_2/||ky||_2 where k is the eigenvalue and y is the left eigenvector. If k=0 the relative error is computed as ||y'A||_2/||y||_2.

### See Also

EPSSolve(), EPSComputeResidualNormLeft(), EPSGetErrorEstimateLeft()

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

### Examples

src/eps/examples/tutorials/ex12.c.html