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Point A slide, and then sketch additional lines showing returns going up on the Point B slide. Bottom row: A split-screen layout starts with a photo on the left on the Point A slide; a second photo is added to the Point B slide.

Cool, right First you put some text into the program, then the list of stop words. Next you get all the words from text into an array called words. Then you get to the magic:

key_words = words.select { |word| !stop_words.include (word) }

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Listing 4-1. Dictionary Example # A simple database # A dictionary with person names as keys. Each person is represented as # another dictionary with the keys 'phone' and 'addr' referring to their phone # number and address, respectively.

Emphasize the dramatic tension that exists between Point A and Point B by sketching two contrasting photographs in juxtaposition. To do this with a Tablet PC, sketch a line down the middle of the Point A slide to indicate that you are going to place two photos side by side. To the left of the line, sketch the photograph that you would like to represent Point A for example, a photograph that shows a downward arrow, as shown on the lower-left slide in Figure 7-7. Add the same sketch to the Point B slide, and then to the right of the midline, sketch a contrasting photograph in this case, an upward arrow. When you show the slides in sequence, the Point A slide introduces the rst photograph as you explain it, and then on the Point B slide, the second photo appears. Depending on which photographs you use for the two sides of the split screen, this pair of contrasting images can communicate the tension between A and B more powerfully than words ever could.

This line first takes your array of words, words, and calls the select method with a block of code to process for each word (like the iterators you played with in 3). The select method is a method available to all arrays and hashes that returns the elements of that array or hash that match the expression in the code block. In this case, the code in the code block takes each word via the variable word, and asks the stop_words array whether it includes any elements equal to word. This is what stop_words.include (word) does. The exclamation mark (!) before the expression negates the expression (an exclamation mark negates any Ruby expression). The reason for this is you don t want to select words that are in the stop_words array. You want to select words that aren t. In closing, then, you select all elements of words that are not included in the stop_words array and assign them to key_words. Don t read on until that makes sense, as this type of single-line construction is common in Ruby programming. After that, working out the percentage of non stop words to all words uses some basic arithmetic:

Installing Ruby from its source code is a great option if you don t mind getting your hands dirty. The process is similar on all forms of Unix (not just Linux). Here are the basic steps: 1. Make sure that your Linux distribution is able to build applications from source by searching for the make and gcc tools. From the terminal you can use which gcc and which make to see if the development tools are installed. If not, you need to install these development tools. 2. Open a Web browser and go to http://www.ruby-lang.org/. 3. Click the Download Ruby link on the right-hand side of the page. If the page s design has changed, look for a link to downloading Ruby. 4. On the download page, click the link to the stable version of the Ruby Source Code. At the time of writing this is ruby-1.8.5. This downloads the tar.gz file containing the source code for the latest stable version of Ruby.

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