labels: Labels from objects

Description

Creates “nice” labels from objects.

Usage

LABELS(x, max_width = NULL, dots = "...", unique = FALSE,
       limit = NULL, …)
LABEL(x, limit = NULL, …)
# S3 method for character
LABEL(x, limit = NULL, quote = sets_options("quote"), …)

Arguments

For LABELS, a vector of R objects (if the object is not a vector, it is converted using as.list). For LABEL, an R object.

max_width

Integer vector (recycled as needed) specifying the maximum label width for each component of x. If NULL, there is no limit, otherwise, the label will be truncated to max_width.

dots

A character string appended to a truncated label. If NULL, nothing is appended.

unique

Logical indicating whether make.unique should be called on the final result.

limit

Maximum length of vectors or sets to be represented as is. Longer elements will be replaced by a label.

quote

Should character strings be quoted, or not? (default: TRUE)

…

Optional arguments passed to the LABEL methods.

Value

A character vector of labels generated from the supplied object(s). LABELS first checks whether the object has names and uses these if any; otherwise, LABEL is called for each element to generate a “short” representation.

LABEL is generic to allow user extensions. The current methods return the result of format if the argument is of length 1 (for objects of classes set and tuple: by default of length 5), and create a simple class information otherwise.

Examples

Run this code

# NOT RUN {
LABELS(list(1, "test", X = "1", 1:5))
LABELS(set(X = as.tuple(1:20), "test", list(list(list(1,2)))))
LABELS(set(pair(1,2), set("a", 2), as.tuple(1:10)))
LABELS(set(pair(1,2), set("a", 2), as.tuple(1:10)), limit = 11)
# }

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