Label chopped intervals by their midpoints

This uses the midpoint of each interval for its label.

Usage

lbl_midpoints(
  fmt = NULL,
  single = NULL,
  first = NULL,
  last = NULL,
  raw = FALSE
)

Arguments

fmt

String, list or function. A format for break endpoints.

single

Glue string: label for singleton intervals. See lbl_glue() for details. If NULL, singleton intervals will be labelled the same way as other intervals.

first

Glue string: override label for the first category. Write e.g. first = "<{r}" to create a label like "<18". See lbl_glue() for details.

last

String: override label for the last category. Write e.g. last = ">{l}" to create a label like ">65". See lbl_glue() for details.

raw

. Use the raw argument to chop() instead.

Value

A function that creates a vector of labels.

Formatting endpoints

If fmt is not NULL then it is used to format the endpoints.

• If fmt is a string, then numeric endpoints will be formatted by sprintf(fmt, breaks); other endpoints, e.g. Date objects, will be formatted by format(breaks, fmt).

• If fmt is a list, then it will be used as arguments to format.

• If fmt is a function, it should take a vector of numbers (or other objects that can be used as breaks) and return a character vector. It may be helpful to use functions from the {scales} package, e.g. scales::label_comma().

See also

Other labelling functions: lbl_dash(), lbl_discrete(), lbl_endpoints(), lbl_glue(), lbl_intervals(), lbl_manual(), lbl_seq()

Examples

chop(1:10, c(2, 5, 8), lbl_midpoints())
#>  [1] 1.5 3.5 3.5 3.5 6.5 6.5 6.5 9   9   9  
#> Levels: 1.5 3.5 6.5 9