| d | Differentiate a function for a single variable. |
| fcts | S4 class _fcts_ |
| fcts_add_fct | appending a S4 class of type _fcts_ |
| gradient | Compute the gradient-function of a function. |
| hessian | Compute the Hessian-function of a function. |
| jacobian | jacobian function |
| simplify | Simplify an expression by computing the values for constant expressions |