# NEPSetConvergenceTest

Sets the function to be used to test convergence of the nonlinear iterative solution.

### Synopsis

    #include "slepcnep.h"
    PetscErrorCode NEPSetConvergenceTest(NEP nep,PetscErrorCode (*func)(NEP,PetscInt,PetscReal,PetscReal,PetscReal,NEPConvergedReason*,void*),void* ctx,PetscErrorCode (*destroy)(void*))

Logically Collective on NEP

### Input Parameters

| nep | - the NEP context
| func | - a pointer to the convergence test function
| ctx | - [optional] context for private data for the convergence routine (may be NULL)
| destroy | - [optional] destructor for the context (may be NULL; PETSC_NULL_FUNCTION in Fortran)

### Calling Sequence of func

      func(NEP nep,PetscInt it,PetscReal xnorm,PetscReal snorm,PetscReal fnorm,NEPConvergedReason reason*,void *fctx)

| nep | - the NEP context
| it | - iteration number
| xnorm | - norm of the current solution
| snorm | - norm of the step (difference between two consecutive solutions)
| fnorm | - norm of the function (residual)
| reason | - (output) result of the convergence test
| fctx | - optional context, as set by NEPSetConvergenceTest()

### See Also

NEPSetTolerances()

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