.NET/ASP.NET/C#/VB.NET PDF Document SDK

Figure 14-44. Simple GSR program The program can be used for a variety of experiments. For example, in biofeedback conditioning, the objective is to learn to relax your body. This would be the same as lowering the body s stress level, and that can be measured as a rising skin resistance. After connecting the electrodes and starting the program, the goal is to make the tone frequency go lower over time. Most people achieve this by relaxing their muscles, taking slow deep breaths, and clearing the mind of anxiety-producing thoughts. When used as a lie detector, the connected subject is asked a series of questions. If subjects answer untruthfully, their body stress level rises, which can be detected as arising frequency tone.

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This means the value has been bound to a special identifier, called it, that is available to other code within the F# interactive session. When any expression is evaluated at the top level, its value is also printed, after the equals sign; note the 3 in the previous example. As you get to know fsi.exe and F# in general, using F# interactive will become more and more useful for debugging programs and finding out how they work. (I discuss values, identifiers, and types in more detail in 3.) You can get code completions by pressing Tab. I find this mode of working useful in testing short programs by copying and pasting them into the console or for checking properties on existing libraries. For example, in Figure 2-2 I checked the System.Environment.Version property. However, I find this mode inconvenient for creating longer programs since it s difficult to store the programs once they re coded; they have to be copied and pasted from the console. Using Visual Studio, even if you don t intend to just run them interactively, you can still easily execute snippets with Alt+Enter. If you save your program with the .fsx extension instead of the .fs extension, you can run your programs interactively by right-clicking them and selecting the Run with F# Interactive menu option, as shown in Figure 2-3. This scripting style of programming is great for creating small programs to automate repetitive tasks. This way your program s configuration, such as the file paths it uses, can be stored inside regular strings in the program and can be quickly edited by the programmer using any text editor as needed.

Appending as children Appending as first child Deleting Inserting after Inserting before Replacing children Replacing Taconite isn t a toolkit it doesn t provide widgets but it s extremely flexible. It will render whatever you throw at it, not just what some developer thought their text box should handle. Of course, if you had to have that snappy widget, it would be pretty easy to build on top of Taconite. And, with the JavaScript-based parser, it ll work with any server-side technology you want to use. Remember, since Taconite is open-source (licensed under the Apache license), you are free to look at the code to tweak it, learn from it, and even port it to your favorite language. Be sure to explore the Taconite home page (sourceforge.net/projects/taconite) for further details.

Building the more advanced projects in this book might require you to learn some new skills. Most electronic products today use construction techniques that involve parts so small you need a microscope to handle them. Fortunately, larger electrical components that you can reasonably work with are still available. Methods to build with these parts have been around for decades, and everything you need is available at Radio Shack or other electronic distributors. For the I2C bus projects in 13, Mindsensors sells prototype boards for the PCF8574 and PCF8591 integrated circuits. They save you from making many of the connections and include the unique NXT socket that saves you from having to cut cables.

Figure 2-3. Running an F# script by right-clicking it You can find more information about the F# programming tools and general programming tools for .NET in 11.

The introduction of Mac OS X Tiger saw hundreds of new features, including a new browser with improved Really Simple Syndication (RSS) support, an automation tool to simplify common tasks, and a lightning-fast desktop search capability One of the most talked about features of Tiger is Dashboard, essentially a collection of mini-applications (see Figure 8-6) For those of you who don t own a Mac (or don t have a friend with one), think of a Dashboard application as a replacement for all those little things you normally launch a browser for several times a day, such as checking your stocks, looking up a word in the dictionary, or checking what s on TV tonight.

CHAPTER 2 I HOW TO OBTAIN, INSTALL, AND USE F#