List of R functions

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This page contains listings of some R functions and commands by category.

Workspace and help

**Workspace and help**
function name	functionality
getwd()	get working directory
setwd(dir)	set working directory to dir
help(topic), ?topic	get help on topic, usually function name
help.search("keyword")	search for help
help.start()	HTML help start page
demo()	list available demonstrations
save(..., file), load(file)	save and load objects
savehistory(file), loadhistory(file)	save and load command history
source(file)	execute commands from file
list.files(dir), dir(dir)	list files in directory dir
q()	quit R

**Objects**
function name	functionality
mode(x)	mode of x
ls(), objects()	list objects in memory
rm(x), rm(list = ls())	remove x or all objects
exists(x)	test if object x exists in memory
as.numeric(x), as.list(x), ...	coerce mode of object x
is.numeric(x), is.na(x), ...	test mode of object x
identical(x, y)	test if objects are identical
return(invisible(x))	return invisible copy (doesn't print)

**Packages**
function name	functionality
install.packages(name)	download and install package name
download.packages(name, dir)	download package name into dir
library(name), require(name)	load package name
data(name)	load dataset name
.libPaths(dir)	add directory dir to library paths
sessionInfo()	list loaded packages