help(topic, offline = FALSE, package = c(.packages(), .Autoloaded),
lib.loc = .lib.loc, verbose = .Options$verbose,
htmlhelp = .Options$htmlhelp)
?topic
topic
| a name or character string on which documentation is sought (but not a variable containing a character string!). |
offline
| a logical indicating whether documentation should be displayed on-line to the screen (the default) or hardcopy of it should be produced. |
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. |
verbose
|
logical; if TRUE, the file name is reported.
|
htmlhelp
|
logical (or NULL). If TRUE (is the
default after help.start has been called), the help
will not be shown on the console, but via the html browser.
|
name (typically, an R
object or a data set) can be printed 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.
If offline is TRUE, hardcopy of the documentation is
produced by running the LaTeX version of the help page through
latex (note that LaTeX 2e is needed) and dvips.
Depending on your dvips configuration, hardcopy will be sent to
the printer or saved in a file. If the programs are in non-standard
locations and hence were not found at compile time, you need to set
the environment variables LATEX and DVIPS appropriately.
The appearance of the output can be customized through a file
`Rhelp.cfg' somewhere in your LaTeX search path.
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.
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'