dtmf meaning

The meaning of covarianceReproduced in: http://bbs.mathchina.com/cgi-bin/topic.cgi?forum=5topic=14444 (thanks to the original author)In probability theory, two random variables X and Y are related to each other in roughly the following 3 cases:When the joint distribution of x, Y is like that, we can see that there are roughly: the larger the X, the greater the X, the smaller the Y, the less the case we call " positive correlation ".When the joint dist

Common paging functions on the Web: What is the meaning of this sentence? $url _query=ereg_replace ("(^|) page= $page", "", $url _query); (^|) This is the meaning of the sentence: ^ represents the starting position, or in the [^..] Non-representative; The meaning of being or; ------ (^|) is ^ or or what? In addition, it is not possible to appear in the URL ^

"^ Quot; symbolic meaning of the RewriteCond command in. htacess? In RewriteCond % {REQUEST_URI }! ^ The meaning of ^ in the group command is in RewriteCond % {REQUEST_URI }! ^/Group/command ^ meaning ^ The Locator specifies that the matching mode must start with the target string, ^ Start with this string. Starting from matching strings, complete is, starting

SQL statement meaning DB: query ( quot; SELECTCOUNT (*) FROM quot ;. DB: table (vgallerys ). quot; whereuidIN (SELECT nbsp; pre_home_friend.fuidFROMpre_home_friendWHEREuid $ discuz_uid) meaning of the SQL statement DB: query ("select count (*) FROM". DB: table ('vgallerys '). "where uid IN (SELECT Pre_home_friend.fuid FROM pre_home_friend WHERE uid = '$ discuz_uid') and album = 0 "); The

Life is a battle for energy.To solve the problem of eating and drinking food and clothing, will ask such questions, the meaning of life is how.In the mood of the sea do not drift, in the fear of death, afraid of shrinking.But these are just appearances.Since the beginning of the pregnancy, the moment has begun, a battle of energy.If people have the original sin, it is from birth to death always from the universe, the Earth to obtain energy, in additio

Summary: no matter how careful we are when writing a program, mistakes are always inevitable. These errors often confuse the PHP compiler. If developers cannot understand the meaning of the compiler error messages, these error messages are not only useless, but often frustrating. When writing a program, no matter how careful we are, making mistakes is always inevitable. These errors often confuse the PHP compiler. If developers cannot understand the

This article transferred from: http://blog.csdn.net/h_o_w_e/article/details/51388500!function () {} (); ! What's the use?From the syntax, the semicolon in JavaScript indicates the end of the statement, and at the beginning, it may be used for compression and other methods to split, indicating a new statement begins. So, if in a separate JS file, the beginning of the semicolon is meaningless, can be deleted.An exclamation point is a logical operator, a "non", a common use of the IF (!true) {}, wh

, rather than providing specific values. For example: Android:textcolor= "? Android:textdisabledcolor" Note that this is very similar to resource references, except that we use a "?" Prefix instead of "@". When you use this tag, you provide the name of the property resource, which will be looked up in the subject, so you do not need to display the declaration of that type (if the declaration is in the form of Android:attr/android:textdisabledcolor). In addition to using the identifier of this re

This article provides a detailed analysis of the meaning of interfaces in php interfaces. For more information, see This article provides a detailed analysis of the meaning of interfaces in php interfaces. For more information, see Everyone may understand this. I guess the meaning of this interface, which is used to call the interface content in the imp

class version issues in the Java serialization mechanismCategory: "Java Basics"2014-10-31 21:13 480 people read reviews (0) favorite reports Directory (?) [+] Original Address: Http://yanwushu.sinaapp.com/java_serialversionuid/Content Introduction Some Java classes that implement the Serializable interface will see a static field named Serialversionuid, which explains the meaning of this field fundamentally.

Ask for the meaning of various regular expression suffixes About the meaning of the expression suffix in PHP, now I am smattering, just know/u table non-greedy match,/I means ignoring case,/s can let "." Match to line break. But do not know what the other suffixes have meaning, so want to ask the system is also looking at this aspect of the predecessors advice.

HTML (Hypertext Markup language/Hypertext Markup Language)Meaning: HTML is a standard markup language for creating Web pages.role: the page can contain pictures, links, and even music, programs and other non-text elements.Understanding: mainly used to build the skeleton of the Web page, is a structural layer, can be understood as the building of the steel concrete.CSS (cascading style sheets/cascading style sheet)