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Open the Example 6 worksheet (shown in Figure 9-6) in the 0901_DynamicIndicators.xlsx file . You ve already come across several examples for multiline category axis labels in this book . This section takes up the topic again and deals with it in greater detail . The category axis label is generated from the two-column range C6:D31 . Column D contains the alphanumeric category labels . Column C contains formulas that generate the figures 1, 2, or 3 using the LARGE function to display the first three ranks . The function =LARGE(array,k) returnes the k-largest value of array . If the k argument, for example, has the value 3 (you want to determine the value with rank 3 from a list) the corresponding formula would return the third largest value of array . The counterpart of this function is =SMALL(array,k) . If the values in the array are identical (for example, 100, 100, 100, 99, 99, 95), this is no problem for Excel: in this case, the largest value is 100 and so are the second largest and third largest values . It becomes more difficult when we want to use this process for further calculations . Consequently, to continue the example, 99 is the fourth largest value after 100 . And the next 99 is the fifth largest . And 95 is the sixth largest . We might think this is funny, Excel doesn t . This is rarely a problem, but that changes when we revert to the logic of LARGE with the beautiful function RANK, which plays a role in additional examples below (LARGE determines the number that corresponds to a rank . RANK determines the rank that corresponds to a number) .

The DCOM service would retry three to five times, and the data would finally appear, as if by magic Obviously, the excessive retries were taking a toll on the application's performance, and the fact that the data wasn't being written to the database was cause for alarm The Outcome After some heavy debugging sessions, Peter found that the DCOM service was performing the reads and writes on separate, nonsynchronized threads The read occurred before a separate instance of the database COM object had written the data This behavior wasn't evident during debugging sessions because the debugger was forcing the proper timing and synchronization He eventually uncovered the problem through appropriate labeling of object instances in the event log.

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Unnecessary or quick mouse movements may not be displayed correctly in your video screen capture due to the low number of frames per second (fps) that are captured (approximately 5 to 10 fps; other video is captured at 15 or 30 fps) Objects move more smoothly and with greater clarity when video is captured at a higher number of frames per second Therefore, as you move an object during a video screen capture, the object may display unevenly if it is moved quickly When you type or select check boxes or option buttons, do these actions slowly to improve the overall quality of the video screen capture Match the video display size with the appropriate presentation template As mentioned earlier in this chapter, you can improve the quality of the video in your presentation by applying a presentation template that displays video at the size it was captured.

The Lesson The big lesson Peter said he learned from this bug was that in a large-scale distributed application such as the one he was working on, you can't assume that the debug environment will accurately represent the release environment He solved the problem by adding appropriate synchronization code and wrapping the component-to-component communications, which originally went through MSMQ individually, into the same transaction along with the database writes such that the messages would be sent only upon transactional commits..

The function =RANK (number,ref,[order]) returns the rank that a number has within a list of numbers . If values in this list (for example, 100, 100, 100, 99, 99, 95) are identical, problems occur for several presentations of results . This list then contains rank 1 three times, but not rank 2, not rank 3, rank 4 twice, not rank 5, and finally rank 6 . This may be okay for mathematics but is not really helpful in a presentation (explain this to a sensitive audience; maybe even under pressure) . This is also the reason why it is sometimes legitimate to manually change these values only by a few millionths, as described below in a different context . It is particularly legitimate if the following two aspects are essential:

In a presentation, you need to present the ranking with descriptions that also include numbers (Rank 1, Rank 2, and so on) . In this case, the presentation could also read Rank 1 = 100, Rank 2 = 100, and so on . Experience has shown that viewers don t have a problem with that . Obviously, it is more irritating when some ranks are missing in an overview . You must use the determined ranks in a continuing calculation . Here it might be possible that you require all of the rankings in a series without gaps .

This is especially true when working with video screen captures Step-by-Step: Capturing Video from Your Computer Screen The following procedure describes the step-by-step process for capturing video from your computer screen..

What was happening in Peter's bug was that the MSMQ reads/writes, not surprisingly, were cycling much faster than the database reads/writes. Even though Peter and his team had walked through and planned all the multithreading carefully, they were still bitten by some initial misunderstanding about how much faster certain operations outside their project would take in the real world. Summary Multithreaded programming is difficult and the area in which you'll encounter some of the hardest bugs you'll ever have to solve. This chapter presented tips, techniques, and key points that should help you avoid deadlocks from the beginning of your project. As I stressed early in the chapter, in multithreaded programming, up-front planning is vital, and you must make sure to allot your team enough time and resources to plan multithreaded applications carefully and correctly. Once you're faced with the inevitable multithreaded deadlocks, however, there's no need to panic: this chapter also covered DeadlockDetection, a utility that will allow you to figure out which threads deadlocked on which synchronization object. Finally and I can't stress this point enough if you're doing multithreaded programming, you must be developing, running, and testing your projects on multiprocessor computers. If you're not, you probably shouldn't be doing multithreaded programming because you're leaving yourself open to some extremely serious bugs.