| as.data.frame.mapping | Convert a mapping to 'data.frame' | 
| cf | Construct a 'factor' from one or more vectors | 
| codomain | Domain and codomain of a mapping. | 
| cut_mapping | Mapping from continuous to categorical | 
| domain | Domain and codomain of a mapping. | 
| inverse | Inverse of a mapping | 
| mapping | Generate a Mapping Function | 
| print.mapping | Print a mapping | 
| remap | Re-map a variable | 
| text2mapping | Convenient shorthand for specifying mappings with text strings |