# QEPSetTolerances

Sets the tolerance and maximum iteration count used by the QEP convergence tests.

### Synopsis

    #include "slepcqep.h"
    PetscErrorCode QEPSetTolerances(QEP qep,PetscReal tol,PetscInt maxits)

Logically Collective on QEP

### Input Parameters

| qep | - the quadratic eigensolver context
| tol | - the convergence tolerance
| maxits | - maximum number of iterations to use

### Options Database Keys

| -qep_tol <tol> | - Sets the convergence tolerance
| -qep_max_it <maxits> | - Sets the maximum number of iterations allowed

### Notes

Pass 0 for an argument that need not be changed.

Use PETSC_DECIDE for maxits to assign a reasonably good value, which is dependent on the solution method.

### See Also

QEPGetTolerances()

Location: src/qep/interface/qepopts.c
Index of all QEP routines
Table of Contents for all manual pages
Index of all manual pages