List of R functions
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This page contains listings of some R functions and commands by category.
Basics
| function name | functionality |
|---|---|
| c() | "combine" elements to a vector |
| array() | creates arrays |
| data.frame() | creates data.frames |
| list() | creates lists |
| mean() | mean of the elements of the input vector |
| sd() | standard deviation of the elements of the input vector |
| cor() | correlation |
| quantile() | quantiles |
| read.table() | reads delimited text files |
| write.table() | writes delimited text files |
| save() | save R objects |
| load() | load R objects |
| apply(), tapply(), lapply() | functions for applying functions over set margins, apply is for arrays, tapply for data.frames and lapply for lists |
| merge() | merges two data.frames, equivalent of SQL joins |
| order() | sorts data by given factors, output is an indexing vector |
| library() | loads packages |
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 |
Statistical tests
| function name | functionality |
|---|---|
| t.test | en:Student's t-test |
| aov | en:Analysis of variance |
