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Why is the parallelogram area between two vectors (x1, Y1), (X2, Y2) (x1 * y2-x2 * Y1 )?

Link: http://blog.csdn.net/zhangxaochen/article/details/8027003 All of a sudden, I want to solve this problem. In fact, this is just a sentence that I don't know .. It is estimated that college students like me have to wait for a moment to see this question... At least I forgot about the determining factor. 1. I first thought of High School analytic ry knowledge. Because if you think of (X2, Y2) as the bottom edge of Parallelogram, the s

POSTGRES-XC/XL/X2 Distributed Database Installation __ Database

Function Introduction POSTGRES-XC/XL/X2 is an open source project. It provides a multiple-master synchronous, transparent, PostgreSQL cluster solution. Unlike other cluster tools, it has a strong scalability when writing data, and introduces the concept of cluster environment with multiple master architectures. Multi-master means that when writing data, it is no longer subject to a single master node and will be well improved in writing speed. POSTGR

Tostring ("x2 ")

/// /// Convert byte type to string/// /// /// Private string bytearraytostring (byte [] arrinput){Int I;Stringbuilder soutput = new stringbuilder (arrinput. Length );For (I = 0; I {Soutput. append (arrinput [I]. tostring ("X2 "));}// Convert the Instance value to system. StringReturn soutput. tostring ();} /// /// Unpackage the received data (unpack the received byte array as a unicode string)/// /// /// Public String dispackage (byte [] recbytes){S

CRC (16-bit) polynomial is x16+x15+x2+1

The corresponding check bits column 1 1000 0000 0000 0101, but this is 17, ah, I how and 16 bits of information to different or AH? Not the highest bit of 1You don't understand the meaning of CRC.The 17 bits are followed by 16 zeros and then started or calculated. Total 33 bits.Before and after the operation, a one to come: When this value is 1, take this bit to start the next 16-bit and check polynomial XOR, the result is replaced by the corresponding 16-bit value; When this bit number is 0, sk

Dolby Audio X2 (DAX2) unauthorized vulnerability

Lenovo Security Bulletin: LEN-4884 Potential impact: Local ultra vires vulnerability Severity: High Summary: A vulnerability exists in the file permissions of the Dolby Audio X2 (DAX2) software utility that allows local users to run files using system-level permissions. Describe: Dolby Audio X2 (DAX2) is an industry standard software program developed by Dolby Laboratories for many vendors, which allow

discuz! X2 of annex table and theme picture Table analysis

1. Background:In discuz! In the X2, the original 1 attachment tables and an attachment description table were combined and then divided into 11 tables, which greatly enhanced the support of the forum for the amount of attachment data, while alleviating the problem of high server load due to the large number of attachment records. At the same time, add a theme picture table, if a theme of the landlord affixed with a picture attachment, the attachment w

The problem of mpgaout. dll cannot be found when X2 is started.

. Finally, copy all the Files in C: \ Program Files \ Common Files \ Ulead Systems \ MPEG To the X2 directory of the audio and video, and double-click "audio and video X2 ", "miracle" appeared, and went in. Since all the files are installed on your computer, these DLL files are stored in a separate directory, which is unreasonable. So how can I find these library files when the main program vstudio.exe is

Discuz x2 Personal Data sorting problem resolution, adding custom fields, modifying column names, and introducing

"); $allowitems =array ();//Empty The array of the original small items to sort the new arraywhile ($value = Db::fetch ($query)) {$allowitems [$value [' fieldid ']] = $value [' FieldID '];}} //Two-time development >>>*/Calculate the intersection problem $jiaoji because, but do not calculate, the personal signature and the area does not seem to show, the intersection of other elements I do not know is the above understand, anyway, I realized the effect, you see where the need to modify it.(ii) A

Discuz! X2 help document solution-php Tutorial

Discuz! X2 help documentation experts who have Discuz! For more information, see [email #160; protected]. thank you very much ------ solution ------------------ discuz! X does not help documentation. nbsp; you can only pay more attention to his site to download 1 some plug-ins to study how to do it, or download the template Discuz! X2 help document Who have Discuz! For more information, see [email protec

Precautions for changing the domain name of discuz X2

Recently, I have encountered several Website access problems due to domain name change. These days have all been integrated together, so I have made a small topic on the frequently-used PHP open-source CMS system (www.51php.com) domain name change issue, I hope everyone will like it and support a lot of worry-free PHP virtual hosts. Discuz X2 is also a common system for webmasters. If we change the domain name for discuz

Discuz X2 security research report: 0-day analysis of SQL and XSS Injection Vulnerabilities (Nevel Security Team)

Recently, DiscuzX2 was revealed to have two 0day vulnerabilities, one being the SQL injection vulnerability. Attackers can exploit this vulnerability to obtain the user name and password, and the other being the XSS injection vulnerability, attackers can conduct website Trojans, phishing, and other activities. Currently, the official version 0629 has been released for this issue, the following is the vulnerability analysis report of the Nevel security team imiyoo on the 0day of disucz

Discuz! X2 attachment table sharding and topic image table Parsing

1. Background:In discuz! In X2, the original attachment table and one attachment description table are combined and then divided into 11 tables, which greatly enhances the Forum's support for the attachment data volume, at the same time, server load is high when there are many attachment records.At the same time, a topic image table is added. If a topic's main poster is attached with an image attachment, the graph with the largest width in the attachm

Discuz X2 static site URL (modify Rewrite Rules for The. htaccess file)

% 1 rewritecond % {QUERY_STRING} ^ (. *) $ rewriterule ^ blog-([0-9] +)-([0-9] + )\. HTML $ home. PHP? MoD = Space uid = $1 Do = Blog id = $2 % 1 rewritecond % {QUERY_STRING} ^ (. *) $ rewriterule ^ archiver/(FID | tid)-([0-9] + )\. HTML $ archiver/index. PHP? Action = $1 value = $2 % 1 1. This isApache Web Server (Virtual Host user ),Note: Modify rewritebase and save it as. htaccess. 2. upload to the directory where your discuz program is located 3. Modify discuz

Cocos2d-x 2.x versus 3.x, cocos2d-x2.x

Cocos2d-x 2.x versus 3.x, cocos2d-x2.x Common class name changes in Cocos2d-x In the following table, the class name is converted to delete the CC prefix directly. Cocos2d-x class name change The conversion of class names in the following table is relatively large. CCString usage change Before: 1 CCString*str=CCString::createWithFormat("%s.png","picture"); Now: 1 std::stringstr=StringUtils::format("%s.png","picture");

[A gull's training note] [Objective-c] [Third Day] [Homework] hit the hamster X2

; Imageview.animationrepeatcount=1; [ImageView startanimating]; [_holeimage Addsubview:imageview]; }}- (void) addtimer{Self.timer= [Nstimer scheduledtimerwithtimeinterval:2target:self selector: @selector (playimage) Userinfo:nil repeats:yes];}- (void) playimage{Nsmutablearray*animationtemp = [[Nsmutablearray alloc] Initwithcapacity:Ten]; for(inti =0; i6; i++) {UIImage*image = [UIImage imagenamed:[nsstring stringWithFormat:@"T%d.png", i+1]]; [Animationtemp Addobject:image]; } Uiimag

Detailed tag pseudo-static settings in discuz X2

1. [tag page pseudo-static] template/default/Tag/tag.htmSet " Misc. php? MoD = tag id = $ tag [tagid] " Change to " Tag-tagtagtagtagid=.html " 2. [tag homepage pseudo-static] template/default/Tag/tagitem.htmSet " Misc. php? MoD = tag " > {Lang tag} " Tag.html " >{ Lang tag} Set " Misc. php? MoD = tag id = $ ID " > $ Tagname " Tag-$ ID/ " > $ Tagname 3. [Forum content page tag pseudo-static] template/default/FORUM/viewthread_node.htmSet " $ Var [1] " Href = " Misc. php? MoD

Discuz! Solutions for incompatibility between X2 and jquery

Introduction: This is discuz! The x2 and jquery incompatible solution details page describes PHP, related knowledge, skills, experience, and some PHP source code. Class = 'pingjiaf' frameborder = '0' src = 'HTTP: // biancheng.dnbc?info/pingjia.php? Id = 339667 'rolling = 'no'> 1. Write your JS script to an external file. 2. Open template/default/common/header_common.htmTip: If you use another style and the style rewrites the header_common.htm file, y

Trivial-difference between hadoop1.X and 2.x,-hadoop1.x2. X

Trivial-difference between hadoop1.X and 2.x,-hadoop1.x2. X 1. jobtracker is separated and divided into resourceManager and nodemanager; 2. MR becomes an application on yarn like HBase and Hive; The default block size of 3.1.x is 64 MB, and the default block size of 2.x is 128 MB; 4. In hadoop versions, what are the differences among 023x, 12x, 22x, 23x, and 24x and what are their direct mappings? Book.51cto.com/art/201312/422133.htmThis

[javascript svg fill stroke stroke-width x1 y1 x2 y2 line stroke-opacity fill-opacity properties explained] svg fill stroke stroke-width s Troke-opacity fill-opacity line drawing lines Properties explained

123456789Ten - to + - the * $Stroke-width= ' 3 ' stroke-opacity = '. 3 ' fill-opacity = '. 9 'Panax Notoginseng>Transparent) Although none is the same as the transparent effect but the mechanism is completely different none is not populated transparent -Is transparent, outlines the stroke as no style = "fill: #09F3C7; stroke: #C7F309;" stroke-opacity = '. 3 ' fill-opacity = '. 9 '-- the + a the[javascript svg fill stroke stroke-width x1 y1 x2 y2 line

discuz! X2 Forum How to give yourself a single page to add access rights

discuz! X2 Forum How to give yourself a single page plus access rights?

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