formatDL {base}R Documentation

Format Description Lists


Format vectors of items and their descriptions as 2-column tables or LaTeX-style description lists.


formatDL(x, y, style = c("table", "list"),
         width = 0.9 * getOption("width"), indent = NULL)


x a vector giving the items to be described, or a list of length 2 or a matrix with 2 columns giving both items and descriptions.
y a vector of the same length as x with the corresponding descriptions. Only used if x does not already give the descriptions.
style a character string specifying the rendering style of the description information. If "table", a two-column table with items and descriptions as columns is produced (similar to Texinfo's @table environment. If "list", a LaTeX-style tagged description list is obtained.
width a positive integer giving the target column for wrapping lines in the output.
indent a positive integer specifying the indentation of the second column in table style, and the indentation of continuation lines in list style. Must not be greater than width/2, and defaults to width/3 for table style and width/9 for list style.


After extracting the vectors of items and corresponding descriptions from the arguments, both are coerced to character vectors.

In table style, items with more than indent - 3 characters are displayed on a line of their own.


a character vector with the formatted entries.


## Use R to create the 'INDEX' for package 'splines' from its 'CONTENTS'
x <- read.dcf(file = system.file("CONTENTS", package = "splines"),
               fields = c("Entry", "Description"))
x <-
writeLines(formatDL(x$Entry, x$Description))
## or equivalently: writeLines(formatDL(x))
## Same information in tagged description list style:
writeLines(formatDL(x$Entry, x$Description, style = "list"))
## or equivalently: writeLines(formatDL(x, style = "list"))

[Package base version 2.1.0 Index]