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The next argument you need to specify has nothing to do with the source, which is the frustum, but with the destination, which is the screen. It is the aspect ratio of the 2D window into which the 3D scene will be rendered. Ideally, this will correspond to the ratio of your back buffer, which you can find this way: float aspectRatio = graphics.GraphicsDevice.Viewport.AspectRatio; When using a square window of width and height 300, for example the division will equal 1. However, it will be larger when rendering into a full-screen window of 800 600 pixels and will be even larger when rendering full-screen to a wide-screen laptop or HDTV. If you wrongly passed 1.0 instead of 800/600 as the aspect ratio for an 800 600 window, the resulting image would be stretched horizontally. The two last arguments again have to do with the viewing frustum of Figure 2-2. Imagine there is an object extremely close to the camera. This object would block the entire sight, and chances are the whole window would be covered by one solid color. To avoid such cases, XNA allows you to define a plane in the pyramid, close to the top. Everything between the top of the pyramid (your camera) and this plane will not be drawn. It is said to be clipped away. This plane is called the near clipping plane, and you can specify the distance between your camera and its near clipping plane as the third argument of the CreatePerspectiveFieldOfView method.

The string type has many useful string-manipulation members, including those that allow you to determine their length, change their case, concatenate strings, and perform many other useful tasks. Table 25-1 shows some of the most useful members. Table 25-1. Useful Members of the string Type

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Returns the length of the string Returns a string that is the concatenation of its argument strings Returns a bool value indicating whether the argument is a substring of the object string Returns a formatted string Takes as parameters a string and a position and creates and returns a new copy of the object string, with the parameter string inserted at the given position. Returns a copy of the object string in which a substring has been removed Returns a copy of the object string in which a substring has been replaced Retrieves a substring from the object string Returns a copy of the object string in which the alphabetic characters are all uppercase Returns a copy of the object string in which the alphabetic characters are all lowercase

Calculating LTV for customers as a whole is useful. Calculating the LTV of customer segments is even more useful. An automobile company may nd that the LTV of various models may be quite different, as shown in 4. Two factors, in general, are responsible for the difference: 1. The manufacturer s pro t per car 2. The repurchase rate With that knowledge, it is possible to determine the additional total pro t that a company would earn if the repurchase rate could be modi ed by changing the behavior of customers. This knowledge can lead to the development of marketing programs aimed at particular customer segments.

The names of many of the methods in Table 25-1 sound as if they are changing the string object. Actually, they re not changing the strings but returning new copies. For a string, any change allocates a new immutable string. For example, the following code declares and initializes a string called s. The first WriteLine statement calls the ToUpper method on s, which returns a copy of the string in all uppercase. The last line prints out the value of s, showing that it is unchanged. string s = "Hi there."; Console.WriteLine("{0}", s.ToUpper()); Console.WriteLine("{0}", s); This code produces the following output: HI THERE. Hi there. // Print uppercase copy // String is unchanged

All the factors in a lifetime value table can be in uenced by marketing programs: the average order size, the number of orders per year, and the retention rate. To see the way this works, let s focus on only one

The StringBuilder class helps you dynamically and efficiently produce strings without too many copies being made. The StringBuilder class is a member of the BCL, in namespace System.Text. A StringBuilder object is a mutable array of Unicode characters.

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