argument of the maximum/minimum arg max f(x): 当f(x)取最大值时,x的取值 arg min f(x):当f(x)取最小值时,x的取值 表示使目标函数取最小值时的变量值From Wikipedia In mathematics, arg max (or argmax) stands for the argument of the maximum, that is to say, the set of points of the given argum…
argument of the maximum/minimum arg max f(x): 当f(x)取最大值时,x的取值 arg min f(x):当f(x)取最小值时,x的取值 表示使目标函数取最小值时的变量值From Wikipedia In mathematics, arg max (or argmax) stands for the argument of the maximum, that is to say, the set of points of the given argum…
1.π (Pi; periphery/周长) March 14 marks Pi Day, the holiday commemorating the mathematical constant π (pi), written numerically as 3.141592+. Since mathematic notation is a language that uses symbols from a multitude of alphabets and typefaces, it seem…
参考: Write math and make a box with alltt environment LaTex Verbatim 环境下使用数学符号 在 Verbatim 环境下使用数学符号,需要借助额外的宏包,fancyvrb.例如: \documentclass{article} \usepackage{fancyvrb} \begin{document} \begin{Verbatim}[commandchars=\\\{\}, codes={\catcode`\$=3\catcod…
1.#{}表示一个占位符号,通过#{}可以实现preparedStatement向占位符中设置值,自动进行java类型和jdbc类型转换,#{}可以有效防止sql注入. #{}可以接收简单类型值或pojo属性值. 如果parameterType传输单个简单类型值,#{}括号中可以是value或其它名称. 使用#传入参数是,sql语句解析是会加上"",比如 select * from table where name = #{name} ,传入的name为小李,那么最后打印出来的就是…
[声明]本帖的内容是copy来的,来源为stack overflow. It has several meanings in Scala, all related to its mathematical meaning as implication. In a value, it introduces a function literal, or lambda. e.g. the bit inside the curly braces in List(1,2,3).map { (x: Int)…
java泛型中的标记符含义: E - Element (在集合中使用,因为集合中存放的是元素) T - Type(Java 类) K - Key(键) V - Value(值) N - Number(数值类型) ? - 表示不确定的java类型 S.U.V - 2nd.3rd.4th types Object跟这些标记符代表的java类型有啥区别呢? Object是所有类的根类,任何类的对象都可以设置给该Object作引用变量,使用的时候可能需要类型强制转换, 但是用使用了泛型T.E等…