R: Getting Help with R (2024)

Helping Yourself

Before asking others for help, it’s generally a good idea for you to try to help yourself. R includes extensive facilities for accessing documentation and searching for help. There are also specialized search engines for accessing information about R on the internet, and general internet search engines can also prove useful (see below).

R Help: help() and ?

The help() function and ? help operator in R provide access to the documentation pages for R functions, data sets, and other objects, both for packages in the standard R distribution and for contributed packages. To access documentation for the standard lm (linear model) function, for example, enter the command help(lm) or help("lm"), or ?lm or ?"lm" (i.e., the quotes are optional).

To access help for a function in a package that’s not currently loaded, specify in addition the name of the package: For example, to obtain documentation for the rlm() (robust linear model) function in the MASS package, help(rlm, package="MASS").

Standard names in R consist of upper- and lower-case letters, numerals (0-9), underscores (_), and periods (.), and must begin with a letter or a period. To obtain help for an object with a non-standard name (such as the help operator ?), the name must be quoted: for example, help('?') or ?"?".

You may also use the help() function to access information about a package in your library — for example, help(package="MASS") — which displays an index of available help pages for the package along with some other information.

Help pages for functions usually include a section with executable examples illustrating how the functions work. You can execute these examples in the current R session via the example() command: e.g., example(lm).

Vignettes and Code Demonstrations: browseVignettes(), vignette() and demo()

Many packages include vignettes, which are discursive documents meant to illustrate and explain facilities in the package. You can discover vignettes by accessing the help page for a package, or via the browseVignettes() function: the command browseVignettes() opens a list of vignettes from all of your installed packages in your browser, while browseVignettes(package=package-name) (e.g., browseVignettes(package="survival")) shows the vignettes, if any, for a particular package. vignette() is employed similarly, but displays a list of vignettes in text form.

You can also use the vignette("vignette-name") command to view a vignette (possibly specifying the name of the package in which the vignette resides, if the vignette name is not unique): for example, vignette("timedep") or vignette("timedep", package="survival") (which are, in this case, equivalent).

Vignettes may also be accessed from the CRAN page for the package (e.g.survival), if you wish to review the vignette for a package prior to installing and/or using it.

Packages may also include extended code demonstrations (“demos”). The command demo() lists all demos for all packages in your library, while demo(package="package-name") (e.g., demo(package="stats")) lists demos in a particular package. To run a demo, call the demo() function with the quoted name of the demo (e.g., demo("nlm")), specifying the name of the package if the name of the demo isn’t unique (e.g., demo("nlm", package="stats"), where, in this case, the package name need not be given explicitly).

Searching for Help Within R

The help() function and ? operator are useful only if you already know the name of the function that you wish to use. There are also facilities in the standard R distribution for discovering functions and other objects. The following functions cast a progressively wider net. Use the help system to obtain complete documentation for these functions: for example, ?apropos.

apropos()

The apropos() function searches for objects, including functions, directly accessible in the current R session that have names that include a specified character string. This may be a literal string or a regular expression to be used for pattern-matching (see ?"regular expression"). By default, string matching by apropos() is case-insensitive. For example, apropos("^glm") returns the names of all accessible objects that start with the (case-insensitive) characters "glm".

help.search() and ??

The help.search() function scans the documentation for packages installed in your library. The (first) argument to help.search() is a character string or regular expression. For example, help.search("^glm") searches for help pages, vignettes, and code demos that have help “aliases,” “concepts,” or titles that begin (case-insensitively) with the characters "glm". The ?? operator is a synonym for help.search(): for example, ??"^glm".

RSiteSearch()

RSiteSearch() uses an internet search engine (also see below) to search for information in function help pages and vignettes for all CRAN packages, and in CRAN task views (described below). Unlike the apropos() and help.search() functions, RSiteSearch() requires an active internet connection and doesn’t employ regular expressions. Braces may be used to specify multi-word terms; otherwise matches for individual words are included. For example, RSiteSearch("{generalized linear model}") returns information about R functions, vignettes, and CRAN task views related to the term "generalized linear model" without matching the individual words "generalized", "linear", or "model".

findfn() and ??? in the sos package, which is not part of the standard R distribution but is available on CRAN, provide an alternative interface to RSiteSearch().

help.start()

help.start() starts and displays a hypertext based version of R’s online documentation in your default browser that provides links to locally installed versions of the R manuals, a listing of your currently installed packages and other documentation resources.

R Help on the Internet

There are internet search sites that are specialized for R searches, including search.r-project.org (which is the site used by RSiteSearch) and Rseek.org.

It is also possible to use a general search site like Google, by qualifying the search with “R” or the name of an R package (or both). It can be particularly helpful to paste an error message into a search engine to find out whether others have solved a problem that you encountered.

CRAN Task Views

CRAN Task Views are documents that summarize R resources on CRAN in particular areas of application, helping your to navigate the maze of thousands of CRAN packages. A list of available Task Views may be found on CRAN.

R FAQs (Frequently Asked Questions)

There are three primary FAQ listings which are periodically updated to reflect very commonly asked questions by R users. There is a Main R FAQ, a Windows specific R FAQ and a Mac OS (OS X) specific R FAQ.

Asking for Help

If you find that you can’t answer a question or solve a problem yourself, you can ask others for help, either locally (if you know someone who is knowledgeable about R) or on the internet. In order to ask a question effectively, it helps to phrase the question clearly, and, if you’re trying to solve a problem, to include a small, self-contained, reproducible example of the problem that others can execute. For information on how to ask questions, see, e.g., the R mailing list posting guide, and the document about how to create reproducible examples for R on Stack Overflow.

Stack Overflow

Stack Overflow is a well organized and formatted site for help and discussions about programming. It has excellent searchability. Topics are tagged, and “r” is a very popular tag on the site with almost 150,000 questions (as of summer 2016). To go directly to R-related topics, visit http://stackoverflow.com/questions/tagged/r. For an example both of the value of the site’s organization and information that is very useful to R users, see “How to make a great R reproducible example?”, which is also mentioned above.

R Email Lists

The R Project maintains a number of subscription-based email lists for posing and answering questions about R, including the general R-help email list, the R-devel list for R code development, and R-package-devel list for developers of CRAN packages; lists for announcements about R and R packages; and a variety of more specialized lists. Before posing a question on one of these lists, please read the R mailing list instructions and the posting guide.

R: Getting Help with R (2024)

FAQs

What does help() do in R? ›

R Help: help() and ? The help() function and ? help operator in R provide access to the documentation pages for R functions, data sets, and other objects, both for packages in the standard R distribution and for contributed packages.

Can ChatGPT help with RStudio? ›

Key points

To use ChatGPT, write a prompt specifying the data analysis task you want to perform and provide some context or examples. ChatGPT will generate R code you can copy and paste into your RStudio or R console. Suppose the generated code does not work or produces an error.

Where can I get help for RStudio? ›

Get Online RStudio Expert Help in 6 Minutes. Codementor is a leading on-demand mentorship platform, offering help from top RStudio experts. Whether you need help building a project, reviewing code, or debugging, our RStudio experts are ready to help.

How can I learn R quickly? ›

No one starting point will serve all beginners, but here are 6 ways to begin learning R.
  1. Install , RStudio, and R packages like the tidyverse. ...
  2. Spend an hour with A Gentle Introduction to Tidy Statistics In R. ...
  3. Start coding using RStudio. ...
  4. Publish your work with R Markdown. ...
  5. Learn about some power tools for development.

What does help () do? ›

The help() displays documentation about various Python objects including modules, functions, classes, and keywords. If no argument is passed, the interactive help utility starts up on the command line.

What does the GET () command do in R? ›

get() function in R Language is used to return an object with the name specified as argument to the function. This is another method of printing values of the objects just like print function.

Does ChatGPT know the R code? ›

ChatGPT can answer questions about a wide range of technology subjects, including how to write R code. That means ChatGPT's power is available to every R programmer, even those who know little about large language models.

What is the best AI to help with coding in R? ›

Sourcegraph Cody

Cody is an AI coding assistant that uses a deep understanding of your codebase to help you understand, write, and fix code faster. Cody is powered by Sourcegraph's code graph and has knowledge of your entire codebase to provide context-aware explanations and suggestions inside your IDE.

Why use RStudio instead of R? ›

RStudio is actually an add-on to R: it takes the R software and adds to it a very user-friendly graphical interface. Thus, when one uses RStudio, they are still using the full version of R while also getting the benefit of greater functionality and usability due to an improved user interface.

What is the shortcut for help in RStudio? ›

Keyboard Shortcuts
DescriptionWindows & LinuxMac
Move focus to HelpCtrl+3Ctrl+3
Zoom HelpCtrl+Shift+3Ctrl+Shift+3
Move focus to TerminalAlt+Shift+MShift+Option+M
Show HistoryCtrl+4Ctrl+4
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Apr 16, 2024

Which command is used to help in R? ›

Use the help() command.

Is there an alternative to RStudio? ›

gedit (Linux; comes with most Linux distributions) MacVim (Mac OS) Nano (Linux) Notepad++ (Windows)

Is R easier than Python? ›

Is Python or R easier? Python is much more straightforward, using syntax closer to written English to execute commands. However, R makes it easier to visualize and manipulate data if you have other languages under your belt. It's statistics-based, so the syntax here is more straightforward for analysis.

Is R the hardest programming language? ›

Since Python has so many libraries, it can be challenging to become familiar with them. R, however, has fewer libraries, making this language easier to work with. Generally speaking, Python's syntax is easier to read, and some users find it a more straightforward language to learn than R.

Why learning R becomes tough? ›

Learning R can be hard because there are many special cases in R to remember. R is the best user of memory. Explanation: Statistics for relatively advanced users. R has thousands of packages, designed, maintained, and widely used by statisticians.

What is the help search function in R? ›

The help.search() function in R searches the help system. This function searches for the help system for documentation matching. It does so for a given character string in the file name, title, alias, concept, and keywords entries.

What is the use of help () and dir () functions? ›

Difference Between dir() and help() in Python
Python dir()Python help()
Assists in solving effortful problems in a simple wayAssists in knowing about the new modules or other objects quickly
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Dec 8, 2023

What does the data () function help with in R? ›

data() was originally intended to allow users to load datasets from packages for use in their examples, and as such it loaded the datasets into the workspace . GlobalEnv . This avoided having large datasets in memory when not in use: that need has been almost entirely superseded by lazy-loading of datasets.

What is the Help tab in R studio? ›

For example, to open the help page for our friend the mean() function. or you can use the equivalent shortcut. After you run the code, the help page is displayed in the 'Help' tab in the Files pane (usually in the bottom right of RStudio).

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