| E04HCF | Check user's routine for calculating first derivatives of function |
| E04HDF | Check user's routine for calculating second derivatives of function |
| E04YAF | Check user's routine for calculating Jacobian of first derivatives |
| E04YBF | Check user's routine for calculating Hessian of a sum of squares |
| E04ZCF | Check user's routines for calculating first derivatives of function and constraints |