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The Rails internet framework has taken the software program via hurricane, delivering legions of net builders the facility to create websites quicker and extra successfully than ever sooner than. yet making the most of Rails potential studying a completely new paradigm, as well as the language Rails is equipped upon: Ruby. therefore, different developer groups have carried out their very own models of Rails, yet equipped utilizing their hottest language. For thousands of Java builders, this local framework is Grails, and the Java-centric scripting language its outfitted upon: Groovy.
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Highly winning and renowned textual content proposing an in depth and finished advisor for all R clients
The R language is well-known as essentially the most robust and versatile statistical software program programs, allowing clients to use many statistical concepts that might be very unlikely with no such software program to assist enforce such huge facts units. R has develop into a vital instrument for figuring out and undertaking research.
• positive aspects complete color textual content and wide portraits throughout.
• Introduces a transparent constitution with numbered part headings to assist readers find info extra efficiently.
• appears to be like on the evolution of R during the last 5 years.
• includes a new bankruptcy on Bayesian research and Meta-Analysis.
• offers a completely revised and up-to-date bibliography and reference section.
• Is supported by way of an accompanying site permitting examples from the textual content to be run through the user.
Praise for the 1st edition:
'. .. while you are an R consumer or wannabe R consumer, this article is the person who could be in your shelf. The breadth of themes lined is unsurpassed in terms of texts on facts research in R. ' (The American Statistician, August 2008)
'The High-level software program language of R is atmosphere criteria in quantitative research. And now anyone can familiarize yourself with it due to The R e-book. .. ' (Professional Pensions, July 2007)
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Often called SSADM, the established platforms research and layout technique is now commonly followed as a software program layout method within the public quarter. This ebook covers the latest model of the strategy - model four.
Extra resources for Beginning Groovy and Grails: From Novice to Professional
AssertionError. Listing 2-11 is an example of the Groovy assertion in Listing 2-10 failing. Listing 2-11. AssertionError: One isn't Two Expression: (1 == 2) As you can see, the error message from Listing 2-10 is embedded in Listing 2-11. Assertions are very handy and one of the cornerstones of good testing. They also do a great job of clarifying intentions. You will see assertions in many of the examples throughout this book. Strings Like most modern languages, Groovy has the concept of a string.
Line 9 illustrates using the each() method to iterate through the array. That deserves a second look. Yes, the each() method is available on the array, which is very convenient. Line 10 also shows something interesting—it uses a range to access the array. In this case, the example goes one step further and shows accessing the array from left to right. 17. org/JN1025-Arrays 18. qxd 32 5/15/08 6:05 PM Page 32 CHAPTER 2 ■ GROOVY BASICS Maps A Groovy map19 is an unordered collection of key/value pairs, where the key is unique, just as in Java.
If you are running a script, Groovy will generate a class with a main method containing the script commands, compile the script, and execute it. If you don’t want to recompile the file each time it is run, you can use the third option. • Compile the file using groovyc into a class and execute it using Java. You saw an example of this approach in the previous section. groovy. groovy to the Groovy runtime. " Groovy Shell The Groovy Shell3 is an interactive command-line application (shell) that allows you to create, run, save, and load Groovy scripts and classes.