R Graphical Manual

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Last data update: 2014.03.03

R: Show the usage of a function

usage

R Documentation

Show the usage of a function

Description

Print the reformatted usage of a function. The arguments of the function are searched by argsAnywhere, so the function can be either exported or non-exported in a package. S3 methods will be marked.

Usage

usage(FUN, width = getOption("width"), tidy = TRUE, output = TRUE)

Arguments

`FUN`	the function name
`width`	the width of output (passed to `width.cutoff` in `tidy_source`)
`tidy`	whether to reformat the usage code
`output`	whether to write the output to the console (via `cat`)

Value

The R code for the usage is returned as a character string (invisibly).

Examples

library(formatR)
usage(var)

usage(plot)

usage(plot.default)  # default method
usage("plot.lm")  # on the 'lm' class

usage(usage)

usage(barplot.default, width = 60)  # narrower output