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As you can see, January 29 plus a month causes problems for 1997, which is not a leap year. If you change 1997-01-29 to 1997-01-28 on the second line, there is no longer a problem. 7. Investigate the difference between the date formats WW and IW (week number and ISO week number) using an arbitrary date, and explain your findings. Solution 5-7. SQL> 1 select date '2005-01-01' as input_date 2 , to_char(date '2005-01-01', 'ww') as ww 3 , to_char(date '2005-01-01', 'iw') as iw 4* from dual INPUT_DATE WW IW ----------- -- -01-JAN-2005 06 07 SQL> If you don t get different results, try different dates within the same week. The difference between WW and IW has to do with the different definitions of week numbers. The WW format starts week number 1 on January 1, regardless of which day of the week that is. The ISO standard uses different rules: an ISO week always starts on a Monday. The rules around the new year are as follows: if January 1 is a Friday, a Saturday, or a Sunday, the week belongs to the previous year; otherwise, the week fully belongs to the new year. Similar rules apply for the ISO year numbering. 8. Look at Listing 5-15, where we use the REGEXP_INSTR function to search for words. Rewrite this query using REGEXP_LIKE. Hint: You can use {n,} to express at least n times. Solution 5-8a. First Solution SQL> select comments 2 from history 3 where regexp_like(comments, '([^ ]+ ){8,}'); COMMENTS -----------------------------------------------------------Not a great trainer; let's try the sales department! Sales also turns out to be not a success... Hired as the new manager for the accounting department Junior sales rep -- has lots to learn... :-) SQL> You could make your solution more readable by using character classes.

Create the necessary static variables by adding the following code at the top of FaceDetectViewController.m, right below the import declarations:

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The best way to get started hacking your Robosapien is to work through 13 a few times, taking the robot apart and putting it back together, and trying some of the easier hacks I have outlined not just in this chapter, but throughout the book. Another good idea is to get is a soldering practice kit (or two). Most electronics stores (online or otherwise) carry them and they are an excellent introduction to how to use a soldering iron. They will usually include a soldering iron, some solder, a practice PCB, a bunch of electronic components, and some instructions. Soldering is definitely something that takes practice. While you might not be interested in doing some of the more complicated types of hacks, soldering is still a good skill to have for some of the easier hacks, too. It will expand your options for integrating bolt-on hacks, it will help you to mount LEDs, hook up battery packs all in all it is a valuable lesson. I think the future of hacking the Robosapien is bright. From what I have heard, the new version of Robosapien, dubbed V2 by WowWee and due out in late 2005, will be nowhere near as hackable as the first version, probably in large part because it abandons much of the simplicity of Robosapien version 1.

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#import "FaceDetectViewController.h" // Filename where the Haar Cascade is stored. static const char *CASCADE_NAME = "haarcascade_frontalface_alt_tree.xml"; // Temporary storage for the cascade. Due to its size, it is best to make it static. static CvMemStorage *cvStorage = NULL; // Pointer to the cascade, we also only need one. static CvHaarClassifierCascade *haarCascade = NULL; @implementation FaceDetectViewController

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Loading a cascade is a time-intensive procedure that uses a lot of memory. XML is a very inefficient way to store numbers and on top of that, OpenCV s XML parsing is very wasteful. Therefore, you only want to do it once if possible. For this simple app, it suffices to place the cascade initialization in the viewDidLoad: method in FaceDetectViewController.m.

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- (void)viewDidLoad { [super viewDidLoad]; cvStorage = cvCreateMemStorage(0); NSString *resourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: [NSString stringWithUTF8String:CASCADE_NAME]]; haarCascade = (CvHaarClassifierCascade *)cvLoad([resourcePath UTF8String], 0, 0, 0); }

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