Like in Visual Studio you can group several functions and data they operate in the project, which is a folder in filesystem with a several special files.  When project is opened those special files are loaded automatically creating environment that is close to the one you used to have when you last close the project.

RStudio projects are associated with R working directories. You can create an RStudio project:

To create a new project use the Create Project command (available on the Projects menu and on the global toolbar):

When a new project is created RStudio:
  1. Creates a project file (with the extension.Rproj ) in the project directory. This file contains various project options and can also be used as a shortcut for opening the project directly from the filesystem.
  2. Creates a hidden directory (named .Rproj.user ) where project-specific temporary files (e.g. auto-saved source documents, window-state, etc.) are stored. This directory is also automatically added to .Rbuildignore, .gitignore, etc. if required.
  3. Loads the project into RStudio and display its name in the Projects toolbar (which is located on the far right side of the main toolbar)

There are several ways to open a project:

  1. Using the Open Project command (available from both the Projects menu and the Projects toolbar) to browse for and select an existing project file (e.g. MyProject.Rproj).
  2. Selecting a project from the list of most recently opened projects (also available from both the Projects menu and toolbar).
  3. Double-clicking on the project file within the system shell (e.g. Windows Explorer, OSX Finder, etc.).

When a project is opened within RStudio the following actions are taken:

To run a script pass a string with its name to the source function.

When you are within a project and choose to either Quit, close the project, or open another project the following actions are taken:

You can work with more than one RStudio project at a time by simply opening each project in its own instance of RStudio. There are two ways to accomplish this:

  1. Use the Open Project in New Window command located on the Project menu.
  2. Opening multiple project files via the system shell (i.e. double-clicking on the project file).

There are several options that can be set on a per-project basis to customize the behavior of RStudio. You can edit these options using the Project Options command on the Project menu:

R command line provides access to help via ?[function] or ??[topic]

Sites and free books 

Note: An excellent resource as books and websites related to R is 60+ R resources to improve your data skills Computerworld. Please visit it.

A large, cookbook-style collection of material on R contains Stack Overflow site.

Free books (adapted from The R Programming Language - Free Computer, Programming, Mathematics, Technical Books, Lecture Notes and Tutorials)

R has its own LaTeX-like documentation format, which is used to supply comprehensive documentation, both on-line in a number of formats and in hard copy.

See also R Bookshelf

Packages and CRAN

The power of R is heavily based on a large set available packages which extend the core language. R package structure reminds Perl. Similar to Perl, the main repository is called Comprehensive R Archive Network (CRAN). It contains thousands of packages. A core set of packages is included with the installation of R The set of packages loaded on startup is by default can be displayed using the command: 

> getOption("defaultPackages")

All-in-all there are around 6K additional packages for R and 120,000 functions (as of June 2014) available at the CRAN and other repositories.  In other words R like Perl is suffering from package glut.  the following discussion would resonate with any long-term Perl user (Does R have too many packages R-bloggers)

1 Lack of long term maintenance of packages.  This has been a challenge that I have faced when using R packages which I believe will provide the solution to my problem but these packages frequently are not maintained at the same rate as the R base system.

And how could they be?  The base system is updated several times a year while there are thousands of packages.  To update each of those packages for minor changes in the base system seems foolish and excessive.  However, as the current structure of R stands, to fail to update these packages results in packages which previously worked, no longer functioning.  This is a problem I have experienced and is frankly very annoying.

One solution might be to limit the number of packages to those which have a sufficient developer base to ensure long term maintenance.  However, this would likely stifle the creativity and productivity of the wide R developer base.

Another solution is to limit the number of base system updates in order to limit the likelihood that a package will become outdated and need updating.

A third option, which I believe is the most attractive, is to allow code to specify what version of R it is stable on and for R to act for the commands in that package as though it is running on a previous version of R.  This idea is inspired by how Stata handles user written commands.  These commands simply specify version number for which the command was written under.  No matter what later version of Stata is used, the command should still work.

I understand that such an implementation would require additional work from the R core team for each subsequent update.  However, such an investment may be worth it in the long run as it would decrease the maintenance in response to R base updates.

2 The super abundance of R packages.  The concern is that there are so many packages that users might find it difficult to wade through them in order to find the right package.  I don't really see this as a problem.  If someone wanted to learn to use all R packages then of course this task would be nearly impossible.  However, with me as I believe with most people, I learn to use new functions within packages to solve specific problems.  I don't really care how many packages there are out there.  All I care is that when I ask a question on google or StackOverflow about how to do x or y, someone can point me to the package and command combination necessary to accomplish the task.

3 The inconsistent quality of individual packages.  It is not always clear if user written packages are really doing what they claim to be doing.  I know personally I and am constantly on the look out for checks to make sure my code is doing what I think it is doing, yet still I consistently find myself making small errors which only show up through painstaking experimentation and debugging. 

CRAN has some automated procedures in which packages are tested to ensure that all of their functions work without errors under normal circumstances.  However, as far as I know, there are no automated tests to ensure the commands are not silently giving errors by doing the wrong thing.  These kind of error controls are entirely left up to the authors and users.  This concern comes to mind because one of my friends recently was running two different Bayesian estimation packages which were supposed to produce identical results yet each returned distinctly different results with one set having significant estimates and the other not.  If he had not thought to try two different packages then he would never have thought of the potential errors inherent in the package authorship.

A solution to inconsistent package quality controls may be to have a multitiered package release structure in which packages are first released in "beta form" but require an independent reviewing group to check functionality and write up reports before attaining "full" release status.  Such an independent package review structure may be accomplished by developing an open access R-journal specifically geared towards the review, release, and revision of R packages.

4 The lack of hierarchical dependencies.  This is a major point mentioned in Kurt Hornik's paper.  He looks at package dependencies and found that the majority of packages have no dependencies upon other packages.  This indicates that while there are many packages out there, most packages are not building on the work of other packages.  This produces the unfortunate situation in which it seems that many package developers are recreating the work of other package developers.  I am not really sure if there is anything that can be done about this or if it really is an issue.

It does not bother me that many users recode similar or duplicate code because I think the coding of such code helps the user better understand the R system, the user's problem, and the user's solution.  There is however the issue that the more times a problem is coded, the more likely someone will code an error.  This beings us back to point 3 in which errors must be rigorously pursued and ruthlessly exterminated through use of an independent error detection system.

5 Insufficient Meta Package Analysis.  A point that Kurt Hornik also raises is that there are a lot of R packages out there but not a lot of information about how those packages are being used.  In order to further this goal, it might be useful to build into future releases of R the option to report usage statistics on which packages and functions are being used in combination with which other packages.  Package developers might find such information useful when evaluating what functions to update.

R packages are installed into libraries, which are directories in the file system containing a subdirectory for each package installed there.

R comes with a single library, R_HOME/library which is the value of the R object ‘.Library’ containing the standard and recommended packages.

Both sites and users can create others and make use of them (or not) in an R session. At the lowest level ‘.libPaths()’ can be used to add paths to the collection of libraries or to report the current collection.

R will automatically make use of a site-specific library R_HOME/site-library if this exists (it does not in a vanilla R installation). This location can be overridden by setting ‘.Library.site’ in R_HOME/etc/Rprofile.site, or (not recommended) by setting the environment variable R_LIBS_SITE. Like ‘.Library’, the site libraries are always included into ‘.libPaths()’.

Users can have one or more libraries, normally specified by the environment variable R_LIBS_USER. This has a default value (to see it, use ‘Sys.getenv("R_LIBS_USER")’ within an R session), but that is only used if the corresponding directory actually exists (which by default it will not).

Both R_LIBS_USER and R_LIBS_SITE can specify multiple library paths, separated by colons (semicolons on Windows).

Another strength of R is static graphic which can be produced using ggplot2 package. It can produce publication-quality graphs, including mathematical symbols. Dynamic and interactive graphics are available through additional packages.

Packages allow specialized statistical techniques, graphic output (ggplot2), import/export capabilities, reporting tools (knitr, Sweave), etc. Packages are developed primarily in R. Sometimes C, C++,  Fortran are used. 

Other R package repositories include  R-forge and Bioconductor

There is also a community site for rating and reviewing all CRAN packages called Crantastic.

Language

Adapted from Programming in R Thomas Girke, UC Riverside

R is C style language that does not do a good job of enhancing C syntax and avoiding it shortcomings. It is stuck in 90 mentality and in comparison with Perl does not extend syntax much.

This is the dynamically typed language with fist class functions, closures, objects, vector operations, pass parameters by value. Has special values for variables such as NULL and NA. Everything is nullable.

R is an interpreted language; users typically access it through a command-line interpreter. If a user types "2+2" at the R command prompt and presses Enter, the computer replies with "4", as shown below:

> 2+2 
[1] 4

Variable names in R can contain dot character which serves the role similar to underscore (... is used to indicate a variable number of function arguments). R uses $ in a manner analogous to the way other languages use dot.

R has several one-letter reserved words: c, q, s, t, C, D, F, I, and T.

R's data structures include vectors, lists, matrices, arrays, data frames (list of vectors; similar to tables in a relational database). There is no scalar type in R. A scalar is represented as a vector with length one  The scalar data type was never a data structure of R. 

Vectors are one dimensional collections used to, most frequently, store one sort of data (Numbers, Text, ...).  Indices in R start at 1, not at 0. In this way R resembles FORTRAN.  x[1] is the first element of vector x. Vector is  an ordered collection of elements with no other structure. The length of a vector is the number of elements. Operations are applied componentwise. For example, given two vectors x and y of equal length, x*y would be the vector whose nth component is the product of the nth components of x and y. Also, log(x) would be the vector whose nth component is the logarithm of the nth component of x. Vectors are created using the c function. For example, p <- c(2,3,5,7) sets p to the vector containing the first four prime numbers.

R supports procedural programming with functions. A generic function acts differently depending on the type of arguments passed to it. In other words, the generic function dispatches the function (method) specific to that type of object. There is also OO system for R (actually two). 

R has a generic print() function that can print almost every type of object in R with a simple 

print(objectname)

Overview of syntax.

Statistical features

R and its libraries implement a wide variety of statistical and graphical techniques, including linear and nonlinear modeling, classical statistical tests, time-series analysis, classification, clustering, and others. R is easily extensible through functions and extensions, and the R community is noted for its active contributions in terms of packages. There are some important differences, but much code written for S runs unaltered. Many of R's standard functions are written in R itself, which makes it easy for users to follow the algorithmic choices made.

R can link and call at run time C, C++, and Fortran code. Advanced users can write their own C, C++, Java, [NET or Python code to manipulate R objects directly.

Examples

Readers wishing to get a feel for R can start with the introductory session given in A sample session.

From Wikipedia:

Example 1[edit]

The following examples illustrate the basic syntax of the language and use of the command-line interface.

In R, the widely preferred assignment operator is an arrow made from two characters "<-", although "=" can be used instead.[26]

> x <- c(1,2,3,4,5,6) # Create ordered collection (vector)
> y <- x^2 # Square the elements of x
> print(y) # print (vector) y
[1] 1 4 9 16 25 36
> mean(y) # Calculate average (arithmetic mean) of (vector) y; result is scalar
[1] 15.16667
> var(y) # Calculate sample variance
[1] 178.9667
> lm_1 <- lm(y ~ x) # Fit a linear regression model "y = f(x)" or "y = B0 + (B1 * x)"
# store the results as lm_1
> print(lm_1) # Print the model from the (linear model object) lm_1

Call: 

lm(formula = y ~ x)

Coefficients: 

(Intercept) x
-9.333 7.000

> summary(lm_1) # Compute and print statistics for the fit # of the (linear model object) lm_1

Call:
lm(formula = y ~ x)
Residuals:
1 2 3 4 5 6
3.3333 -0.6667 -2.6667 -2.6667 -0.6667 3.3333
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -9.3333 2.8441 -3.282 0.030453 *
x 7.0000 0.7303 9.585 0.000662 ***
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 3.055 on 4 degrees of freedom
Multiple R-squared: 0.9583, Adjusted R-squared: 0.9478
F-statistic: 91.88 on 1 and 4 DF, p-value: 0.000662
> par(mfrow=c(2, 2)) # Request 2x2 plot layout
> plot(lm_1) # Diagnostic plot of regression model

Diagnostic graphs produced by plot.lm() function. Features include mathematical notation in axis labels, as at lower left.

Example 2[edit]

Short R code calculating Mandelbrot set through the first 20 iterations of equation z = z² + c plotted for different complex constants c. This example demonstrates: use of community-developed external libraries (called packages), in this case caTools package handling of complex numbers multidimensional arrays of numbers used as basic data type, see variables C, Z and X.

library(caTools) # external package providing write.gif function
jet.colors <- colorRampPalette(c("#00007F", "blue", "#007FFF", "cyan", "#7FFF7F",
"yellow", "#FF7F00", "red", "#7F0000"))
m <- 10000 # define size
C <- complex( real=rep(seq(-1.8,0.6, length.out=m), each=m ),
imag=rep(seq(-1.2,1.2, length.out=m), m ) )
C <- matrix(C,m,m) # reshape as square matrix of complex numbers
Z <- 0 # initialize Z to zero
X <- array(0, c(m,m,20)) # initialize output 3D array
for (k in 1:20) { # loop with 20 iterations
Z <- Z^2+C # the central difference equation
X[,,k] <- exp(-abs(Z)) # capture results
}
write.gif(X, "Mandelbrot.gif", col=jet.colors, delay=800)

"Mandelbrot.gif" – Graphics created in R with 14 lines of code in Example 2

Example 3[edit]

The ease of function creation by the user is one of the strengths of using R. Objects remain local to the function, which can be returned as any data type.[27] Below is an example of the structure of a function:

functionname <- function(arg1, arg2, ... ){ # declare name of function and function arguments
statements # declare statements
return(object) # declare object data type
}
sumofsquares <- function(x){ # a user-created function 
return(sum(x^2)) # return the sum of squares of the elements of vector x
}
> sumofsquares(1:3)
[1] 14
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Old News ;-)

[Dec 06, 2017] Install R on RedHat errors on dependencies that don't exist

Highly recommended!
Dec 06, 2017 | stackoverflow.com

Jon ,Jul 11, 2014 at 23:55

I have installed R before on a machine running RedHat EL6.5, but I recently had a problem installing new packages (i.e. install.packages()). Since I couldn't find a solution to this, I tried reinstalling R using: 
sudo yum remove R

and

sudo yum install R

But now I get:

....
---> Package R-core-devel.x86_64 0:3.1.0-5.el6 will be installed
--> Processing Dependency: blas-devel >= 3.0 for package: R-core-devel-3.1.0-5.el6.x86_64
--> Processing Dependency: libicu-devel for package: R-core-devel-3.1.0-5.el6.x86_64
--> Processing Dependency: lapack-devel for package: R-core-devel-3.1.0-5.el6.x86_64
---> Package xz-devel.x86_64 0:4.999.9-0.3.beta.20091007git.el6 will be installed
--> Finished Dependency Resolution
Error: Package: R-core-devel-3.1.0-5.el6.x86_64 (epel)
           Requires: blas-devel >= 3.0
Error: Package: R-core-devel-3.1.0-5.el6.x86_64 (epel)
       Requires: lapack-devel
Error: Package: R-core-devel-3.1.0-5.el6.x86_64 (epel)
       Requires: libicu-devel
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

I already checked, and blas-devel is installed, but the newest version is 0.2.8. Checked using:

yum info openblas-devel.x86_64

Any thoughts as to what is going wrong? Thanks.

Scott Ritchie ,Jul 12, 2014 at 0:31

A cursory search of blas-devel in google shows that the latest version is at least version 3.2. You probably used to have an older version of R installed, and the newer version depends on a version of BLAS not available in RedHat? – Scott Ritchie Jul 12 '14 at 0:31

bdemarest ,Jul 12, 2014 at 0:31

Can solve this by sudo yum install lapack-devel , etc.. until the errors stop. – bdemarest Jul 12 '14 at 0:31

Jon ,Jul 14, 2014 at 4:08

sudo yum install lapack-devel does not work. Returns: No package lapack-devel available. Scott - you are right that blas-devel is not available in yum. What is the best way to fix this? – Jon Jul 14 '14 at 4:08

Owen ,Aug 27, 2014 at 18:33

I had the same issue. Not sure why these packages are missing from RHEL's repos, but they are in CentOS 6.5, so the follow solution works, if you want to keep things in the package paradigm: 
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/lapack-devel-3.2.1-4.el6.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/blas-devel-3.2.1-4.el6.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/texinfo-tex-4.13a-8.el6.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/libicu-devel-4.2.1-9.1.el6_2.x86_64.rpm
sudo yum localinstall *.rpm

cheers

UPDATE: Leon's answer is better -- see below.

DavidJ ,Mar 23, 2015 at 19:50

When installing texinfo-tex-5.1-4.el7.x86_654, it complains about requiring tex(epsd.tex), but I've no idea which package supplies that. This is on RHEL7, obviously (and using CentOS7 packages). – DavidJ Mar 23 '15 at 19:50

Owen ,Mar 24, 2015 at 21:07

Are you trying to install using rpm or yum? yum should attempt to resolve dependencies. – Owen Mar 24 '15 at 21:07

DavidJ ,Mar 25, 2015 at 14:18

It was yum complaining. Adding the analogous CentOS repo to /etc/yum.repos.d temporarily and then installing just the missing dependencies, then removing it and installing R fixed the issue. It is apparently a issue/bug with the RHEL package dependencies. I had to be careful to ensure the all other packages came from the RHEL repos, not CentOS, hence not a good idea to install R itself when the CentOS repo is active. – DavidJ Mar 25 '15 at 14:18

Owen ,Mar 26, 2015 at 4:49

Glad you figured it out. When I stumbled on this last year I was also surprised that the Centos repos seemed more complete than RHEL. – Owen Mar 26 '15 at 4:49

Dave X ,May 28, 2015 at 19:33

They are in the RHEL optional RPMs. See Leon's answer. – Dave X May 28 '15 at 19:33

Leon ,May 21, 2015 at 18:38

Do the following:
  1. vim /etc/yum.repos.d/redhat.repo
  2. Change enabled = 0 in [rhel-6-server-optional-rpms] section of the file to enabled=1
  3. yum install R

DONE!

I think I should give reference to the site of solution:

https://bluehatrecord.wordpress.com/2014/10/13/installing-r-on-red-hat-enterprise-linux-6-5/

Dave X ,May 28, 2015 at 19:31

Works for RHEL7 with [rhel-7-server-optional-rpms] change too. – Dave X May 28 '15 at 19:31

Jon ,Aug 4, 2014 at 4:49

The best solution I could come up with was to install from source. This worked and was not too bad. However, now it isn't in my package manager.

[Dec 06, 2017] Download RStudio Server -- RStudio

Dec 06, 2017 | www.rstudio.com
RStudio Server v0.99 requires RedHat or CentOS version 5.4 (or higher) as well as an installation of R. You can install R for RedHat and CentOS using the instructions on CRAN: https://cran.rstudio.com/bin/linux/redhat/README .

RedHat/CentOS 6 and 7

To download and install RStudio Server open a terminal window and execute the commands corresponding to the 32 or 64-bit version as appropriate.

64bit
Size: 43.5 MB MD5: 1e973cd9532d435d8a980bf84ec85c30 Version: 1.1.383 Released: 2017-10-09

$ wget https://download2.rstudio.org/rstudio-server-rhel-1.1.383-x86_64.rpm
$ sudo yum install --nogpgcheck rstudio-server-rhel-1.1.383-x86_64.rpm

See the Getting Started document for information on configuring and managing the server.

Read the RStudio Server Professional Admin Guide for more detailed instructions.

[Dec 06, 2017] The difficulties of moving from Python to R

Dec 06, 2017 | blog.danwin.com

This post is in response to: Python, Machine Learning, and Language Wars , by Sebastian Raschka

As someone who's switched from Ruby to Python (because the latter is far easier to teach, IMO) and who has also put significant time into learning R just to use ggplot2, I was really surprised at the lack of relevant Google results for "switching from python to r" – or similarly phrased queries. In fact, that particular query will bring up more results for R to Python , e.g. " Python Displacing R as The Programming Language For Data ". The use of R is so ubiquitous in academia (and in the wild, ggplot2 tends to wow nearly on the same level as D3) that I had just assumed there were a fair number of Python/Ruby developers who have tried jumping into R. But there aren't minimaxir's guides are the most and only comprehensive how-to-do-R-as-written-by-an-outsider guides I've seen on the web.

By and far, the most common shift seems to be that of Raschka's – going from R to Python:

Well, I guess it's no big secret that I was an R person once. I even wrote a book about it So, how can I summarize my feelings about R? I am not exactly sure where this quote is comes from – I picked it up from someone somewhere some time ago – but it is great for explaining the difference between R and Python: "R is a programming language developed by statisticians for statisticians; Python was developed by a computer scientist, and it can be used by programmers to apply statistical techniques." Part of the message is that both R and Python are similarly capable for "data science" tasks, however, the Python syntax simply feels more natural to me – it's a personal taste.

That said, one of the things I've appreciated about R is how it "just works" I usually install R through Homebrew, but installing RStudio via point and click is also straightforward . I can see why that's a huge appeal for both beginners and people who want to do computation but not necessarily become developers. Hell, I've been struggling for what feels like months to do just the most rudimentary GIS work in Python 3 . But in just a couple weeks of learning R – and leveraging however it manages to package GDAL and all its other geospatial dependencies with rgdal – been able to create some decent geospatial visualizations (and queries) :

... ... ...

I'm actually enjoying plotting with Matplotlib and seaborn, but it's hard to beat the elegance of ggplot2 – it's worth learning R just to be able to read and better understand Wickham's ggplot2 book and its explanation of the "Grammar of Graphics" . And there's nothing else quite like ggmap in other languages.

Also, I used to hate how <- was used for assignment. Now, that's one of the things I miss most about using R. I've grown up with single-equals-sign assignment in every other language I've learned, but after having to teach some programming the difference between == and = is a common and often hugely stumping error for beginners. Not only that, they have trouble remembering how assignment even works, even for basic variable assignment I've come to realize that I've programmed so long that I immediately recognize the pattern, but that can't possibly be the case for novices, who if they've taken general math classes, have never seen the equals sign that way. The <- operator makes a lot more sense though I would have never thought that if hadn't read Hadley Wickham's style guide .

Speaking of Wickham's style guide, one thing I wish I had done at the very early stages of learning R is to have read Wickham's Advanced R book – which is free online (and contains the style guide). Not only is it just a great read for any programmer, like everything Wickham writes, it is not at all an "advanced" book if you are coming from another language. It goes over the fundamentals of how the language is designed. For example, one major pain point for me was not realizing that R does not have scalars – things that appear to be scalars happen to be vectors of length one. This is something Wickham's book mentions in its Data structures chapter .

Another vital and easy-to-read chapter: Wickham's explanation of R's non-standard evaluation has totally illuminated to me why a programmer of Wickham's caliber enjoys building in R, but why I would find it infuriating to teach R versus Python to beginners.

(Here's another negative take on non-standard evaluation , by an R-using statistician)

FWIW, Wickham has posted a repo attempting to chart and analyze various trends and metrics about R and Python usage . I won't be that methodical; on Reddit, r/Python seems to be by far the biggest programming subreddit. At the time of writing, it has 122,690 readers . By comparison, r/ruby and r/javascript have 31,200 and 82,825 subscribers, respectively. The R-focused subreddit, r/rstats , currently has 8,500 subscribers.

The Python community is so active on Reddit that it has its own learners subreddit – r/learnpython – with 54,300 subscribers .

From anecdotal observations, I don't think Python shows much sign of diminishing popularity on Hacker News, either. Not just because Python-language specific posts keep making the front page, but because of the general increased interest in artificial intelligence, coinciding with Google's recent release of TensorFlow , which they've even quickly ported to Python 3.x .

[Sep 18, 2016] R Weekly

Sep 18, 2016 | tm.durusau.net
September 12th, 2016 R Weekly

A new weekly publication of R resources that began on 21 May 2016 with Issue 0 .

Mostly titles of post and news articles, which is useful, but not as useful as short summaries, including the author's name.

Learning R and Perl - Stack Overflow

I can recommend Penn University's Introductory Course on R.

The ggplot chapter alone is worth reading - I found ggplot very confusing but this is a great explanation.

Getting Started with R – RStudio Support

> Garrett Grolemund,

New to R?

There are hundreds of websites that can help you learn the language. Here's how you can use some of the best to become a productive R programmer.

Start by downloading R and RStudio.

Learn the basics

Visit Try R to learn how to write basic R code. These interactive lessons will get you writing real code in minutes, and they'll tell you immediately when you go wrong.

Broaden your skills

Work through The Beginner's Guide to R by Computerworld Magazine. This 30 page guide will show you how to install R, load data, run analyses, make graphs, and more.

Practice good habits

Read the Google R Style Guide for advice on how to write readable, maintainable code. This is how other R users will expect your code to look when you share it.

Look up help

When you need to learn more about an R function or package, visit Rdocumentation.org, a searchable database of R documentation. You can search for R packages and functions, look at package download statistics, and leave and read comments about R functions.

Ask questions

Seek help at StackOverflow, a searchable forum of questions and answers about computer programming. StackOverflow has answered (and archived) over 40,000 questions related to R programming. You can browse StackOverflow's archives and see which answers have been upvoted by users, or you can ask your own R related questions and wait for a response.

If you a have question that is more about statistical methodology there are also plenty of R users active on the the CrossValidated Q&A community.

Keep tabs on the R community

Read R bloggers, a blog aggregator that reposts R related articles from across the web. A good place to find R tutorials, announcements, and other random happenings.

Deepen your expertise

Once you've gained some familiarity with R, The R Inferno provides an entertaining roadmap to some of the deeper subtleties of the language and how to work with it most effectively.

This blog post by Noam Ross also provides valuable advice for writing fast R code.

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Now that you know R, work through our Shiny lessons to learn how to make interactive web apps with R.

[Jun 10, 2015] The R Language The Good The Bad And The Ugly - John Cook

"...May be a bit old, but a good talk on the quirks and niceties of R"
Mar 27, 2013 | YouTube

Here's a description of John's talk from GOTO Aarhus 2012: R is a domain-specific language for analyzing data. Why does data analysis need its own DSL? What does R do well and what does it do poorly? How can developers take advantage of R's strengths and mitigate its weaknesses? This talk will give some answers to these questions.

Jesus M. Castagnetto

May be a bit old, but a good talk on the quirks and niceties of R

[Jun 09, 2015] The R Programming Language - Free Computer, Programming, Mathematics, Technical Books, Lecture Notes and Tutorials

Brought To You By the Letter R: Microsoft Acquiring Revolution Analytics

timothy from the interesting-choice-of-letter dept.

theodp writes Maybe Bill Gates' Summer Reading this year will include The Art of R Programming. Pushing further into Big Data, Microsoft on Friday announced it's buying Revolution Analytics, the top commercial provider of software and services for the open-source R programming language for statistical computing and predictive analytics. "By leveraging Revolution Analytics technology and services," blogged Microsoft's Joseph Sirosh, "we will empower enterprises, R developers and data scientists to more easily and cost effectively build applications and analytics solutions at scale." Revolution Analytics' David Smith added, "Now, Microsoft might seem like a strange bedfellow for an open-source company [RedHat:Linux as Revolution Analytics:R], but the company continues to make great strides in the open-source arena recently." Now that it has Microsoft's blessing, is it finally time for AP Statistics to switch its computational vehicle to R?

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