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