## Online Documentation

## Usage

    help(topic, package = c(.packages(),.Autoloaded), lib.loc = .lib.loc)

    ?topic

## Arguments

`topic` | a name or character string on which documentation is sought (but not a variable containing a character string!).
`package` | a name or character vector giving the packages to look into for documentation. By default, all packages in the search path are used.
`lib.loc` | A character vector of directory names of R libraries. Defaults to all libraries currently known.

## Description

These functions provide online access to documentation. Documentation on a topic with name `name` (typically, an R object or a data set) can be printed on-screen with either `help(name)` or `?name`. In the case of unary and binary operators and control-flow special forms, the name may need to be be quoted.

## See Also

`help.start()` which opens the HTML version of the R Manual; `library` for listing available packages and the user-level objects they contain; `data` for listing available data sets; `methods`.

See `prompt` to get a prototype for writing `help` pages of private packages.

## Examples

    help()
    help(help)		# the same

    help(lapply)
    ?lapply			# the same

    help("for")		# or ?"for", but the quotes are needed
    ?"+"

    help(package = stepfun)	# get help even when it's not present

    data()			# list all available data sets
    ?women			# information about data set "women"

    topi <- "women"
    help(topi) ##--> Error: No documentation for `topi'

[Package Contents]