Allows extension packages to make use of the formula parsing of specials.
new_specials(..., .required_specials = NULL, .xreg_specials = NULL)
Arguments
- ...
A named set of functions which used to parse formula inputs
- .required_specials
The names of specials which must be provided (and if not, are included with no inputs).
- .xreg_specials
The names of specials which will be only used as inputs to other specials (most commonly xreg).