| %L+% | Add components to a ggloop object. | 
| %M% | The modified combination of the modulus function ('%%') and integer divisor function ('%/%'). | 
| %R% | The replacement operator. Replaces the 'lhs' with 'rhs' on the condition that 'length(lhs) == FALSE' (the length is '0'). | 
| aes_eval | Assign inputs to 'x', 'y' or 'dots'. | 
| aes_group | Create unique pairings between 'x', 'y' and 'dots'. | 
| aes_loop | Create a list of grouped aesthetic mappings. | 
| cur_vars_env | Helper functions to select NSE (non-standard evaluation) variable names. | 
| expand.grid2 | A new version of an old favorite with some extra options | 
| extract | Extract the nth element from vectors in a list. | 
| fun.par | Regular expression pattern for determing if possible function parenthesis are present. Searches for '"("' and '")"' preceeded by any number of characters. | 
| ggloop | Create ggplot plots in a loop. | 
| is.c | Determine if the first element of a parse tree is identical to the 'c' function. | 
| is.fun | Is it a function? | 
| is.op | Determine if an input uses an arithmetical operator ('/', '+', '-', '*', '^'). | 
| isFALSE | This is an abbreviation of identical(FALSE, x) to go along with isTRUE() | 
| list.pos | Finds the position of a named list element within a list (with no recurssion). | 
| map_aes | Loop through a list of grouped variables and assign class "uneval" to each element in the group. | 
| messy_eval | Reduce the amount of code by turning this sequence into a function. | 
| name_groups | Extract names for the first level of list components for the returned value of 'ggloop()'. | 
| name_subgroups | Extract names for the second level of list components for the returned value of 'ggloop()'. | 
| recycle.NA | A vector recycler using 'NA'. | 
| recycle.vector | A vector recycler using the contents of the shorter vector to do the recycling. | 
| remap_xy_FALSE | Mimicks R's internal recycling mechanism for the shorter of the two vectors. | 
| remap_xy_NA | Attaches NA during recycling of the smaller of the two vectors. | 
| remap_xy_TRUE | Uses 'expand.grid()' to create all possible combinations of xy pairings. | 
| rm.gg2 | Remove 'ggplot2' style and stand-alone aesthetic arguments (i.e. 'y', 'x:z', etc). | 
| what | Console function for determing: class, type, mode, and names of an object. |