R is a computer language. It’s a tool for doing the computation and number-crunching that set the stage for statistical analysis and decision-making. RStudio is an open source integrated development environment (IDE) for creating and running R code. It’s available in versions for Windows, Mac, and Linux. Although you don’t need an IDE in order to work with R, RStudio makes life a lot easier.

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Download R from the Comprehensive R Archive Network (CRAN). In your browser, type this address if you work in Windows:

cran.r-project.org/bin/windows/base/

Why wont my messages download on my macbook pro. Type this one if you work on the Mac:

cran.r-project.org/bin/macosx/

Click the link to download R. This puts the win.exe file in your Windows computer, or the .pkg file in your Mac. In either case, follow the usual installation procedures. When installation is complete, Windows users see an R icon on their desktop, Mac users see it in their Application folder.

Both URLs provides helpful links to FAQs. The Windows-related URL also links to “Installation and other instructions.”

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Click the link for the installer for your computer, and again follow the usual installation procedures.

After the RStudio installation is finished, click the RStudio icon to open the window shown.

If you already have an older version of RStudio and you go through this installation procedure, the install updates to the latest version (and you don’t have to uninstall the older version).

The large Console pane on the left runs R code. One way to run R code is to type it directly into the Console pane.

The other two panes provide helpful information as you work with R. The Environment and History pane is in the upper right. The Environment tab keeps track of the things you create (which R calls objects) as you work with R. The History tab tracks R code that you enter.

Get used to the word object. Everything in R is an object.

The Files, Plots, Packages, and Help tabs are in the pane in the lower right. The Files tab shows files you create. The Plots tab holds graphs you create from your data. The Packages tab shows add-ons (called packages) you downloaded as part of the R installation. Bear in mind that “downloaded” doesn’t mean “ready to use.” To use a package’s capabilities, one more step is necessary, and you’ll want to use packages.

This figure shows the Packages tab. The packages are in either the user library (which you can see in the figure) or the system library (which you have to scroll down to).

The Help tab, shown here, provides links to a wealth of information about R and RStudio.

To tap into the full power of RStudio as an IDE, click the larger of the two icons in the upper right corner of the Console pane. That changes the appearance of RStudio so that it looks like this:

The top of the Console pane relocates to the lower left. The new pane in the upper left is the Scripts pane. You type and edit code in the Scripts pane and press Ctrl+R (Command+Enter on the Mac), and then the code executes in the Console pane.

Ctrl+Enter works just like Ctrl+R. You can also select Code → Run Selected Line(s).

Sweave / knitr

• Spell checking for Sweave and TeX documents.
• Integrated PDF previewer that supports two-way synchronization (SyncTeX) between the editor and PDF view.
• Support for weaving Rnw files using the knitr package (requires knitr version 0.5 or higher).
• Parsing of TeX error logs to extract errors, warnings, and bad boxes and present them in a navigable list.

Web Publishing

• Editing and previewing R Markdown and R HTML files (like Sweave except for web pages).
• Creation of easy to distribute standalone HTML files (with embedded images).
• Support for including LaTeX and MathML equations in web pages using MathJax.

Source Editing

• Find in files with regular expressions.
• Code folding (expanding and collapsing regions of code).

0.96.331 — August 27th, 2012

Miscellaneous

• Fix issue with git console flashing on windows

0.96.330 — August 6th, 2012

Miscellaneous

• Retina display font rendering for new MacBook Pro
• Add Ctrl+R as a shortcut for Run Code on Windows
• Improved window restoration behavior (especially for multi-monitor configurations)
• Prevent console from flickering after it has been cleared
• Always initialize projects even while the underlying filesystem doesn’t support locking
• Never overwrite exiting project file when creating a new project
• Ensure that source-on-save setting is always respected
• Source documents no longer marked as dirty if they are changed while RStudio is closed
• Find in Files updated to work correctly with OS X 10.8 grep
• RStudio Server compatibility with Safari 6

0.96.316 — June 29th, 2012

Markdown

• Ability to define custom markdown rendering function to override default handling
• HTML preview improvements: set focus on load, preserve anchor when refreshing
• New notebook types based on calling knitr::stitch and knitr::silk
• No longer require escape for MathJax native equations

Miscellaneous

• Syntax highlighting mode for C/C++
• Use current project directory as default for save as dialog
• Fix for narrowing of console width after external PDF preview

0.96.304 — June 8th, 2012

Markdown

• Added Create Notebook for quick reports from R scripts

MathJax

• Support for wider variety of equation delimiters

0.96.233 — June 7th, 2012

Miscellaneous

• Rebuild from correct v0.96 branch

0.96.231 — June 5th, 2012

Markdown

• Fix publish to RPubs on Windows

0.96.230 — June 4th, 2012

Markdown

• Support for publishing markdown documents to RPubs

0.96.228 — May 26th, 2012

Miscellaneous

• Fix symbol lookup incompatibility with R-devel

0.96.227 — May 25th, 2012

MathJax

• Introduce more explicit syntax for equation embedding to eliminate parsing ambiguities
• Update docs to reflect no current support for ASCIIMath equations

0.96.225 — May 23rd, 2012

Sweave/LaTeX

• Comment/Uncomment for LaTeX and Sweave files
• Call Sweave/knitr with –no-save and –no-restore (rather than –vanilla)
• Default to calling pdflatex or xelatex directly (rather than using texi2dvi)
• Don’t spell-check cite* or bibitem commands

Markdown

• Create new documents using a basic template that documents R Markdown syntax
• Eliminate table borders in Markdown CSS
• Improved document title detection
• Added documentation on R code blocks to Markdown quick reference

MathJax

• Use a local version of MathJax for previews (enabling MathJax preview even when offline)
• Use SVG for local MathJax previews on the Mac (but still publish as HTML/CSS)
• Allow embedding multiple inline equations on a single line
• Allow inline equation definitions to span across multiple lines
• Only include HTML-CSS options in local preview mode
• Link to the https version of the MathJax scripts in generated HTML file

Source Editing

• Changed Comment/Uncomment shortcut to Ctrl+Shift+C
• Fixed issue with clipboard shortcuts on Japanese keyboard layouts
• Fixed inability to enter braces in international keyboard layouts on the Mac
• Execute current function now works (fixed regression)

Miscellaneous

• Developer ID code signing for Mac
• Add libjpeg62 dependency for Ubuntu 12.04
• Fix symbol lookup incompatibility with R-devel
• Prevent console access by forked child processes

0.96.122 — May 14th, 2012

Sweave / knitr

• Spell checking for Sweave and TeX documents.
• Integrated PDF previewer that supports two-way synchronization (SyncTeX) between the editor and PDF view.
• Support for weaving Rnw files using the knitr package (requires knitr version 0.5 or higher).
• Parsing of TeX error logs to extract errors, warnings, and bad boxes and present them in a navigable list.
• Chunk option auto-complete, chunk folding, jump to chunk, and iterative execution of chunks.
• Compilation based on multiple input files (support for specifying a root TeX document) .
• TeX formatting commands, block comment/uncomment, and various new compilation options.

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Web Publishing

• Editing and previewing R Markdown and R HTML files (like Sweave except for web pages).
• Creation of easy to distribute standalone HTML files (with embedded images).
• Support for including LaTeX and MathML equations in web pages using MathJax.

Source Editing

• Find in files with regular expressions.
• Code folding (expanding and collapsing regions of code).
• Automatic comment reflowing (Cmd+Shift+/).
• Smart editing of Roxygen comments.
• Syntax highlighting for Markdown, HTML, Javascript, and CSS files.
• New font customization options.

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Miscellaneous

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• Fixed incompatibility with Winbind for PAM authentication.
• Fixed editor cursor off by one line problem that occurred after rapid scrolling.
• Updated to Qt 4.8: required for PDF viewer and to fix OS X Lion trackpad scrolling issue (however as a result 32-bit Mac systems and OS X 10.5 are no longer supported).