R (programming language): Difference between revisions

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{{Technical|introduction|date=May 2025}}

{{Short description|Programming language for statistics}}

{{About|the programming language|the eighteenth letter of the English alphabet|R|other uses|R (disambiguation)}}

{{Use dmy dates|date=June 2018}}

{{Infobox programming language

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| file_ext = {{Unbulleted list|.r<ref>{{Cite web|title=R scripts|url=http://mercury.webster.edu/aleshunas/R_learning_infrastructure/R%20scripts.html|access-date=2021-07-17|website=mercury.webster.edu}}</ref>|.rdata|.rhistory|.rds|.rda<ref>{{Cite web|date=2017-06-09|title=R Data Format Family (.rdata, .rda)|url=https://www.loc.gov/preservation/digital/formats/fdd/fdd000470.shtml|access-date=2021-07-17|website=Loc.gov}}</ref>}}

}}

{{redirect-distinguish|R lang|Erlang}}

'''R''' is a [[programming language]] that is particularly suitable for [[statistical computing]] and [[Data and information visualization|data visualization]]. It has been widely adopted in the fields of [[data mining]], [[bioinformatics]] and, [[data analysis]]/, and [[data science]].<ref>{{Cite journal

|last1=Giorgi

|first1=Federico M.

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|doi-access=free }}</ref>

The core R language is augmentedextended by a large number of [[R package|extension software packages]], which contain [[Reusability|reusable code]], documentation, and sample data. Some of the most popular R packages are in the [[tidyverse]] collection, which enhances functionality for visualizing, transforming, and modelling data, as well as improves the ease of programming (according to the authors and users).<ref>{{Cite web |title=Home - RDocumentation |url=https://www.rdocumentation.org/ |access-date=2025-06-13 |website=www.rdocumentation.org}}</ref>

R software is [[Openfree and source|open-source]] and [[free software]]. R is a [[GNU Project]] and licenseddistributed under the [[GNU General Public License]].<ref name="gnugpl">{{Cite web |title=R - Free Software Directory |url=https://directory.fsf.org/wiki/R#tab=Details |access-date=2024-01-26 |website=directory.fsf.org}}</ref><ref>{{Cite web |title=R: What is R? |url=https://www.r-project.org/about.html |access-date=2025-05-10 |website=www.r-project.org}}</ref> ItThe language is writtenimplemented primarily in [[C (programming language)|C]], [[Fortran]], and [[Self-hosting (compilers)|R itself]]. [[Preprocessor|Precompiled]] [[executable]]s are providedavailable for variousthe major [[operating system]]s (including [[Linux]], [[MacOS]], and [[Microsoft Windows]]).

AsIts core is an [[interpreted language]], R haswith a native [[command line interface]]. MoreoverIn addition, multiple [[Third-party software component|third-party]] applications are available as [[graphical user interface]]s; aresuch available,applications such asinclude [[RStudio]] (an [[integrated development environment]]) and [[Jupyter]] (a [[notebook interface]]).

== History ==

{{Multiple image |total_width = 250 | align = left

{{Gallery

|title header = Co-originators of the R language

|File: image1 = Ross Ihaka (5189180796).jpg

|width=160 | height=170 |noborder=yes

| caption1 = [[Ross Ihaka]]

|align=center

|File: image2 = Robert Gentleman on R Consortium.jpg

|footer=

| caption2 = [[Robert Gentleman (statistician)|Robert Gentleman]]

|File:Ross Ihaka (5189180796).jpg

|Ross Ihaka

|alt1=

|File:Robert Gentleman on R Consortium.jpg

|Robert Gentleman

|alt2=

}}

R was started by professors [[Ross Ihaka]] and [[Robert Gentleman (statistician)|Robert Gentleman]] as a programming language to teach introductory statistics at the [[University of Auckland]].<ref name="otago_pg12">{{Cite web

|last=Ihaka

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</syntaxhighlight>

The [[R package#Comprehensive R Archive Network (CRAN)|Comprehensive R Archive Network]] (CRAN) was founded in 1997 by Kurt Hornik and [[Friedrich Leisch]] to host R's [[source code]], executable files, documentation, and user-created packages.<ref name=":10" /> CRAN's name and scope mimic the [[Comprehensive TeX Archive Network]] (CTAN) and the [[Comprehensive Perl Archive Network]] (CPAN).<ref name=":10">{{Cite journal |last=Hornik |first=Kurt |date=2012 |title=The Comprehensive R Archive Network |url=https://onlinelibrary.wiley.com/doi/10.1002/wics.1212 |journal=WIREs Computational Statistics |language=en |volume=4 |issue=4 |pages=394–398 |doi=10.1002/wics.1212 |issn=1939-5108 |s2cid=62231320|url-access=subscription }}</ref> CRAN originally had only three [[Mirrormirror site|mirror sites]]s and twelve contributed packages.<ref>{{cite Q|Q101068595}}<!-- Announce: CRAN -->.</ref> {{As of|20242025|1006|1630}}, it has 9990 mirrors<ref name=":3">{{Cite web |title=The Status of CRAN Mirrors |url=https://cran.r-project.org/mirmon_report.html |access-date=2024-10-16 |website=cran.r-project.org}}</ref> and 2122,513390 contributed packages.<ref name=":9">{{Cite web |title=CRAN - Contributed Packages |url=https://cran.r-project.org/web/packages/index.html |access-date=2024-10-16 |website=cran.r-project.org}}</ref> Packages are also available in [[Repository (version control)|repositories]] such as R-Forge, Omegahat, and [[GitHub]].<ref>{{Cite web |title=R-Forge: Welcome |url=https://r-forge.r-project.org/ |access-date=2024-09-05 |website=r-forge.r-project.org}}</ref><ref>{{Cite web |title=The Omega Project for Statistical Computing |url=https://www.omegahat.net/ |access-date=2024-09-05 |website=www.omegahat.net}}</ref><ref>{{Cite web |title=Build software better, together |url=https://github.com/trending/r |access-date=2024-09-05 |website=GitHub |language=en}}</ref>

To provide guidance on the CRAN web site, its [https://cran.r-project.org/web/views/ Task Views] area lists packages that are relevant for specific topics; sample topics include [[causal inference]], [[finance]], [[genetics]], [[high-performance computing]], [[machine learning]], [[medical imaging]], [[meta-analysis]], [[social science]]s, and [[spatial statistics]].

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== Community ==

[[File:RConsortiumLogo.webp|thumb|The R Consortium is one of the three main groups that support R]]

There are three main groups that help support R software development:

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''[[The R Journal]]'' is an [[open access]], [[academic journal]] that features short to medium-length articles on the use and development of R. The journal includes articles on packages, programming tips, CRAN news, and foundation news.

[[File:UseR Logo.png|thumb|125x125px|UseR! conference is one place the R community can gather at]]

The R community hosts many conferences and in-person meetups.{{efn|Information about conferences and meetings is available in a community-maintained list on GitHub, {{URL|jumpingrivers.github.io/meetingsR/}}}} These groups include:

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* Directions in Statistical Computing (DSC) ([https://www.r-project.org/conferences/ website])

* [[R-Ladies]]: an organization to promote [[gender diversity]] in the R community ([https://rladies.org website])

* SatRdays: R-focused conferences held on Saturdays ([https://satrdays.orggithub.io/ website])

* RData ConferenceScience & AI Conferences ([https://rstats.ai/ website])

* posit::conf (formerly known as rstudio::conf) ([https://www.posit.co/conference/ website])

On social media sites such as Twitter, the hashtag <code>#rstats</code> can be used to follow new developments in the R community.<ref>{{Cite book |last=Wickham |first=Hadley |url=https://r4ds.had.co.nz/introduction.html |title=1 Introduction {{!}} R for Data Science |last2=Grolemund |first2=Garrett |date=January 2017 |publisher=[[O'Reilly Media]] |year=2017 |isbn=978-1491910399 |edition=1st |language=en}}</ref>

== Examples ==

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</syntaxhighlight>

=== Structure of a function ===

R is able to create [[Function (computer programming)|functions]] that add new functionality for code reuse.<ref>{{cite web|url=http://www.statmethods.net/management/userfunctions.html|title=Quick-R: User-Defined Functions|first=Robert|last=Kabacoff|year=2012|access-date=2018-09-28|website=statmethods.net}}</ref> [[Object (computer science)|Objects]] created within the body of the function (which are enclosed by curly brackets) remain [[Local variable|accessible only]] from within the function, and any [[data type]] may be returned. In R, almost all functions and all [[user-defined function]]s are [[closure (computer programming)|closures]].<ref>{{cite web|url=http://adv-r.had.co.nz/Functional-programming.html#closures|title=Advanced R - Functional programming - Closures|website=adv-r.had.co.nz|first=Hadley|last=Wickham}}</ref>

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</syntaxhighlight>

AnotherAn alternative to nested functions is the use of intermediate objects, rather than the pipe operator:

<syntaxhighlight lang="rout">

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> print(num_mtcars_subset)

[1] 11

</syntaxhighlight>While the pipe operator can produce code that is easier to read, itinfluential isR programmers like [[Hadley Wickham]] advisablesuggest to chain together at most 10-15 lines of code using this operator, asand wellsaving as to chunk codethem into [[Taskobjects (projecthaving management)|sub-tasks]]meaningful thatnames areto savedavoid into[[Code objectsobfuscating|code having meaningful namesobfuscation]].<ref>{{Cite book |last=Wickham |first=Hadley |url=https://r4ds.hadley.nz/ |title=R for data science: import, tidy, transform, visualize, and model data |last2=Çetinkaya-Rundel |first2=Mine |last3=Grolemund |first3=Garrett |date=2023 |publisher=O'Reilly |isbn=978-1-4920-9740-2 |edition=2nd |___location=Beijing; Sebastopol, CA |chapter=4 Workflow: code style |oclc=on1390607935 |chapter-url=https://r4ds.hadley.nz/workflow-style.html}}</ref>

The following is an example having fewer than 10 lines, which some readers may find difficult to grasp in the absence of intermediate named steps:<syntaxhighlight lang="r" line="1">(\(x, n = 42, key = c(letters, LETTERS, " ", ":", ")"))

strsplit(x, "")[[1]] |>

(Vectorize(\(chr) which(chr == key) - 1))() |>

(`+`)(n) |>

(`%%`)(length(key)) |>

(\(i) key[i + 1])() |>

paste(collapse = "")

)("duvFkvFksnvEyLkHAErnqnoyr")</syntaxhighlight>The following is a version of the preceding code that is easier to read:<syntaxhighlight lang="r">

default_key <- c(letters, LETTERS, " ", ":", ")")

f <- function(x, n = 42, key = default_key) {

split_input <- strsplit(x, "")[[1]]

results <- (Vectorize(\(chr) which(chr == key) - 1))(split_input) |>

(`+`)(n) |>

(`%%`)(length(key)) |>

(\(i) key[i + 1])()

combined_results <- paste(results, collapse = "")

return(combined_results)

}

f("duvFkvFksnvEyLkHAErnqnoyr")

</syntaxhighlight>

=== Object-oriented programming ===

The R language has native support for [[object-oriented programming]]. There are two native [[Application framework|frameworks]], the so-called S3 and S4 systems. The former, being more informal, supports single dispatch on the first argument, and objects are assigned to a class simply by setting a "class" attribute in each object. The latter is a system like the [[CLOS|Common Lisp Object System (CLOS)]], with formal classes (also derived from [[S (programming language)#S4|S]]) and generic methods, which supports [[multiple dispatch]] and [[multiple inheritance]]<ref>{{cite web|url=https://stat.ethz.ch/R-manual/R-devel/library/base/html/UseMethod.html|title=Class Methods|access-date=2024-04-25}}</ref>

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== Version names ==

[[File:CD of R 1 0 0.png|alt=A CD with autographs on it|thumb|A CD of R Version 1.0.0, autographed by the core team of R, photographed in Quebec City in 2019|180x180px]]

All R version releases from 2.14.0 onward have [[Code name|codenames]] that make reference to ''[[Peanuts]]'' comics and films.<ref>{{Cite book |last=Monkman |first=Martin |url=https://bookdown.org/martin_monkman/DataScienceResources_book/r-release-names.html |title=Chapter 5 R Release Names {{!}} Data Science with R: A Resource Compendium}}</ref><ref>{{Cite web |last=McGowan |first=Lucy D’Agostino |date=2017-09-28 |title=R release names |url=https://livefreeordichotomize.com/posts/2017-09-28-r-release-names/index.html |access-date=2024-04-07 |website=livefreeordichotomize.com |language=en}}</ref><ref>{{Citation |title=r-hub/rversions |date=2024-02-29 |url=https://github.com/r-hub/rversions |access-date=2024-04-07 |publisher=The R-hub project of the R Consortium}}</ref>

In 2018, core R developer [[Peter Dalgaard]] presented a history of R releases since 1997.<ref name=":2">{{Cite web |last=Dalgaard |first=Peter |date=2018-07-15 |title=What's in a name? 20 years of R release management |url=https://www.youtube.com/watch?v=z1vTSdRolgI |access-date=2024-04-09 |website=[[YouTube]] |format=video}}</ref> Some notable early releases before the named releases include the following:

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!Peanuts reference

!Reference

|-

|4.5.1

|2025-06-13

|Great Square Root

|<ref>{{Cite web |title=Read Peanuts by Charles Schulz on GoComics |url=https://www.gocomics.com/peanuts/1978/02/24 |access-date=2025-06-13 |website=www.gocomics.com |language=en}}</ref>

|<ref>{{Cite web |title=[Rd] R 4.5.1 is released |url=https://hypatia.math.ethz.ch/pipermail/r-announce/2025/000713.html |access-date=2025-06-13 |website=hypatia.math.ethz.ch}}</ref>

|-

|4.5.0

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|2015-03-09

|Smooth Sidewalk

|<ref>{{Cite book |last=Schulz |first=Charles M. |title=Happiness is a warm puppy |date=2019 |publisher=Penguin Workshop |___location=New York : Penguin Workshop |isbn=978-1-5247-8995-4}}</ref>{{Page needed|date=April 2024}}

|<ref>{{Cite web |title=R 3.1.3 is released |url=https://stat.ethz.ch/pipermail/r-announce/2015/000582.html |access-date=2024-04-07 |website=stat.ethz.ch}}</ref>

|-

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** [[Eclipse (software)|Eclipse]] via the [https://marketplace.eclipse.org/content/statet-r/ StatET plugin]

** [[Microsoft Visual Studio|Visual Studio]] via [[R Tools for Visual Studio]].

* [[Source-code editor|Source-code editors]]s:

** [[Emacs Speaks Statistics|Emacs]]

** [[Vim (text editor)|Vim]] via the [https://www.vim.org/scripts/script.php?script_id=2628 Nvim-R plugin]

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** [[C Sharp (programming language)|.NET C#]] ([https://rdotnet.github.io/rdotnet/ website])

Statistical frameworks that use R in the background include [[Jamovi]] and [[JASP]].{{factcitation needed|date=March 2025}}

== Implementations ==

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|s2cid=1989369}}</ref> written in [[C++]].

* [[Oracle Corporation|Oracle's]] [https://github.com/oracle/fastr FastR] built on [https://www.graalvm.org/ GraalVM].

* [[TIBCO Software|TIBCO]] Enterprise Runtime for R (TERR) to integrate with [[Spotfire]].<ref>Jackson, Joab (16 May 2013). [httphttps://www.pcworld.com/article/2038944/tibco-offers-free-r-to-the-enterprise.html TIBCO offers free R to the enterprise]. ''PC World''. Retrieved 20 July 2015.</ref> (The company also created [[S-PLUS|S-Plus]], an implementation of the S language.)

Microsoft R Open (MRO) was an R implementation. As of 30 June 2021, Microsoft began to phase out MRO in favor of the CRAN distribution.<ref>{{cite web