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John Verzani - Getting Started with RStudio

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Dive into the RStudio Integrated Development Environment (IDE) for using and programming R, the popular open source software for statistical computing and graphics. This concise book provides new and experienced users with an overview of RStudio, as well as hands-on instructions for analyzing data, generating reports, and developing R software packages. The open source RStudio IDE brings many powerful coding tools together into an intuitive, easy-to-learn interface. With this guide, youll learn how to use its main componentsincluding the console, source code editor, and data viewerthrough descriptions and case studies. Getting Started with RStudio serves as both a reference and introduction to this unique IDE.Use RStudio to provide enhanced support for interactive R sessions Clean and format raw data quickly with several RStudio components Edit R commands with RStudios code editor, and combine them into functions Easily locate and use more than 3,000 add-on packages in Rs CRAN service Develop and document your own R packages with the code editor and related components Create one-click PDF reports in RStudio with a mix of text and R output

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Getting Started with RStudio
John Verzani
Editor
Mike Loukides

Copyright 2011 John Verzani

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Chapter 1. Overview, Installation

This book introduces users to the RStudio Integrated Development Environment (IDE) for using and programming R, the widely used open-source statistical computing environment. RStudio is a separate open-source project that brings many powerful coding tools together into an intuitive, easy-to-learn interface. RStudio runs in all major platforms (Windows, Mac, Linux) and through a web browser (using the server installation). This book should appeal to newer R users, students who want to explore the interface to get the most out of R, and long-time R users looking for a more modern development environment.

RStudio is periodically released as a stable version, and has daily releases in between. This book, as written, describes one of the daily releasesin particular, version 0.95.75; the current stable release is version 0.94.102. Some features described here, such as the project feature, are not currently available in the stable release.

We will begin with a quick overview of R and IDEs before diving into RStudio.

What is R?

R is an open-source software environment for statistical computing and graphics. R compiles and runs on Windows, Mac OS X, and numerous UNIX platforms (such as Linux). For most platforms, R is distributed in binary format for ease of installation. The R software project was first started by Robert Gentleman and Ross Ihaka. The language was very much influenced by the S language, which was originally developed at Bell Laboratories by John Chambers and colleagues. Since then, with the direction and talents of Rs core development team, R has evolved into the lingua franca for statistical computations in many disciplines of academia and various industries.

R is much more than just its core language. It has a worldwide repository system, the Comprehensive R Archive Network (CRAN)http://cran.r-project.orgfor user- contributed add-on packages to supplement the base distribution. As of 2011, there were more than 3,000 such packages hosted on CRAN and numerous more on other sites. In total, R currently has functionality to address an enormous range of problems and still has room to grow.

R is designed around its core scripting language but also allows integration with compiled code written in C, C++, Fortran, Java, etc., for computationally intensive tasks or for leveraging tools provided for other languages.

What is an IDE?

R, like other programming languages, is extended (or developed) through user-written functions. An integrated development environment (IDE), such as RStudio, is designed to facilitate such work. In addition, unlike many other statistical software packages in which a graphical user interface is employed, a typical user interacts with R primarily through the command line. An IDE for R then must also include a means for issuing commands interactively. R is not unique in this respect, and IDEs for interactive scientific programming languages have matured to include features such as:

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