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through finger detection. If we still find f finger, we can use PCA to analyze the finger's principal component, that is, the finger's direction. This is two constraints (it should be a vector) when you find a finger amount, the actual spatial position of the fingertip is fixed. Here there are three constraints (known ). When we remove the point clouds of our fingers, we have only the palm left. At this time, we can use PCA to analyze the direction of the palm. Here are three constraints (not

then adding our own logic to each menu item, here we are ingenious to pop a toast that we just learned.* Run the program: Hey.. Where is the menu key??? To better demonstrate the effect, let's change the firstactivity inherited from activity to inherit from Appcompatactivity. Now the title bar appears, let us click on the top right corner of the small icon, the menu is displayed, the effect is as follows.Destroy an activityHow do I destroy an activity?In fact, the answer is very simple, just cl

1. Enter the bin directory of Tomcat, for example, my/usr/local/apache-tomcat-8.5.16/bin2. Create a new file setenv.shVI setenv.shand add the following in this file, set the initial heap size-xms, maximum heap size-xmx, minimum heap size-xmnExport catalina_opts= "$CATALINA _opts-xms512m"export catalina_opts= "$CATALINA _opts-xmx1024m"3. Use the following command to open Tomcat./catalina.sh RunYou can see the following in the startup log:This indicates

Learning Goals:To view the running status of the Docker daemonStart, stop, restart the Docker daemonStartup options for the Docker daemonModify and view the startup options for the Docker daemon1. # View Docker running statusMethod One: Ps-ef | grep javaMethod Two: sudo status dockerBack to: Docker start/running, Process 18479Returns the process number that is currently started and is running while returning2.# Start, stop, restart the Docker daemonsudo service docker startsudo service docker st

Database integrity: Reliable + accurate = integrityDatabase integrity: Entities: Ensure that each row has a data field: A column of data references: Guaranteed numbering customization: ensure your own rulesPrimary key: Ensures that each row of Entity data can be differentiated without identical dataConstraint: Name format primary key set Primary keyUNIQUE constraint: Column values can only be unique nullable can be multiple unique names format unique NOT NULLNon-empty constraint: NOT null (canno

1 ImportJava.util.*;2 Public classlianxi04{3 Public Static voidMain (String []a) {4Scanner s =NewScanner (system.in);5System.out.print ("Please type a positive integer:"); 6 intn=s.nextint ();7 intk=2; 8System.out.print (n + "=" );9 while(k N) {Ten if(k = = N) {System.out.println (n); Break;} One Else if(n% k

3.1 built-in type3.1.1 Numeric type Numeric Type integer Type floating-point types Boolean type plural int long Float bool Complex 1) Integer typeAfter Python 3, the integer type is int and no longer distinguishes between integers and long integers (int and long in Python 2.x), and the length of integers is not restr

// Question: decompose a positive integer into a prime factor. For example, enter 90 and print 90 = 2*3*3*5.// Program analysis: to decompose the prime factor of N, you should first find a minimum prime number k, and then follow the steps below to complete:// (1) if the prime number is equal to N, it indicates that the process of decomposing the prime factor is o

be extracted.3) Bottom of the navigation bar. If the navigation bar is applied and most of the activity's bottom navigation bar is the same, the navigation bar can be written as a generic module.4) ListView. Most applications use the ListView to show multiple data. The ListView style may often be adjusted later in the project, so it is better to use the ListView as a common module. Optimization Series related blog posts:Android Development Optimization--memory optimization for bitmap

is, the request.　　5. Find the non-repeating integer in 250 million integers, and the memory is not sufficient to accommodate the 250 million integers.Scenario 1: The use of 2-bitmap (each number allocation 2bit,00 means that there is no, 01 means one time, 10 means multiple times, 11 meaningless), a total memory memory, and can be accepted. Then scan these 250 m

1. Boot the user who needs authorization to the following address:Url 1 https://api.weibo.com/oauth2/authorize?client_id=YOUR_CLIENT_IDresponse_type=coderedirect_uri=YOUR_REGISTERED_REDIRECT_URI 2. If the user agrees to authorize, the page jumps to Your_registered_redirect_uri/?code=code3. In exchange for access TokenUrl

The following is the time to take time to brush the first 5 questions, are the solution of their own, perhaps not the optimal solution, just finishing, convenient for future optimization and promotion1. The Sum of the sums:class Solution: # @return A tuple, (index1, index2) def twosum (self, num, target): = {} for in xrange (len (num)): if dict.get ( Target-num[i], none) = = None := I else:

; } /*output:short doublepointers + 0:000000000062fe30 000000000062fe10pointers + 1:000000000 062fe32 000000000062fe18pointers + 2:000000000062fe34 000000000062fe20pointers + 3:000000000062fe36 000000000062FE28 /c2>*/ I do not know why, I used to go to school to look at the hands of the book, and now look at the pointer is suddenly very simple. Perhaps now the code is much more, it is easy to understand the

PostgreSQL tutorial (5): Functions and operators (1), postgresql Operators I. logical operators: Common logical operators include AND, OR, and not. Its semantics is exactly the same as that of logical operators in other programming languages. Ii. Comparison operators: The following is a list of comparison operators provided by PostgreSQL: The comparison operator can be used for all data types that can be c

the end point of the program execution. Getprofiling () is used to obtain the analysis information. The time consumed by program execution between two tags is calculated using the timeelapsed () method (like the loop in the example ). Finally, use print_r () to output the information to the screen: 0 1 2 3 4 5 6 7 8 9 Time elapsed: 0.000594 Array ( [0] => Array