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.
Usage
new_factor(x = integer(), levels = character(), ..., class = character())
new_ordered(x = integer(), levels = character())
# S3 method for factor
vec_ptype2(x, y, ...)
# S3 method for ordered
vec_ptype2(x, y, ...)
# S3 method for factor
vec_cast(x, to, ...)
# S3 method for ordered
vec_cast(x, to, ...)Arguments
- x
Integer values which index in to
levels.- levels
Character vector of labels.
- ..., class
Used to for subclasses.
Details
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.