# EPSGetErrorEstimateLeft

Returns the left error estimate associated to the i-th computed eigenpair (only available in two-sided eigensolvers).

### Synopsis

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

Not Collective

### Input Parameter

| eps | - eigensolver context
| i | - index of eigenpair

### Output Parameter

errest - the left error estimate

### Notes

This is the error estimate used internally by the eigensolver. The actual error bound can be computed with EPSComputeRelativeErrorLeft(). See also the users manual for details.

### See Also

EPSComputeRelativeErrorLeft()

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