A factor is an integer with attribute levels, a character vector. There
should be one level for each integer between 1 and max(x).
An ordered factor has the same properties as a factor, but possesses
an extra class that marks levels as having a total ordering.
new_factor(x = integer(), levels = character(), ...,
class = character())new_ordered(x = integer(), levels = character())
# S3 method for factor
vec_type2(x, y)
# S3 method for ordered
vec_type2(x, y)
# S3 method for factor
vec_cast(x, to)
Integer values which index in to levels.
Character vector of labels.
Used to for subclasses.
These functions help the base factor and ordered factor classes fit in to
the vctrs type system by providing constructors, coercion functions,
and casting functions. new_factor() and new_ordered() are low-level
constructors - they only check that types, but not values, are valid, so
are for expert use only.