A lot of people have need of means to manipulate and chart data. Some of them are professionals from various fields, some of them are students, some of them are users of computers who have outgrown the meager capabilities of Excel or OpenOffice's Calc, or simply can't stand the spreadsheet model any longer. R is a good solution to these needs.
Recognize that R is not just a programming language, not in the sense of Python or Ruby or C. It is a universe. In addition to the capability in the base language, the availability of hundreds of sophisticated packages extends its capability to all kinds of terrains, from the traditional and statistical, to GIS, spatial, image-based, and nearly research edges. Mastery of those packages would take a lifetime. There are new ones every month.
But these packages are not what the average user needs or wants. What the average user needs or wants is a gentle introduction, how to install R, how to use it for common things, getting data in and out, some graphs, some basic statistical notions. Alas, until recently, most R books were sophisticated presentations, ones giving terse, in depth illustrations of R's uses for statistics and analysis. It was difficult to find discussions on the core language, and most of those went back to S+, and Chambers. Admittedly, there are detailed discussions of these as PDF documents with installations, but these may not be reachable by the casual user.
Fortunately, today we have at one end of the beginners' path, the Venables and Smith AN INTRODUCTION TO R. That text is also available online, and was part of some installations of R, at least on Windows. At the other end of the beginners' path is Rizzo's STATISTICAL COMPUTING WITH R, a book on introductory statistics using R for illustration. And, in the middle of the path, there's this text, Braun and Murdoch's A FIRST COURSE. It's fine. It won't let you down. You won't learn how to do projection pursuit regression with R from it. But, then, many people don't need that.
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