calc

js 类数组arguments详解

℡╲_俬逩灬. 提交于 2020-01-04 05:47:08
arguments并不是一个真正的数组,而是一个“类似数组(array-like)”的对象; 就像下面的这段输出,就是典型的类数组对象: [12, 23, callee: ƒ, Symbol(Symbol.iterator): ƒ] 一、类数组 VS 数组 相同点: 都可用下标访问每个元素 都有length属性 不同点: 数组对象的类型是Array,类数组对象的类型是Object; 类数组对象不能直接调用数组API; 数组遍历可以用for in和for循环,类数组只能用for循环遍历; function calc(){ console.log(arguments); // ["sky", "moon", callee: ƒ, Symbol(Symbol.iterator): ƒ] console.log(arguments[0]); // sky console.log(arguments.length); // 2 // arguments.pop(); // 报错,arguments.pop is not a function } calc('sky', 'moon'); 类数组对象转为数组对象方法: Array . prototype . slice . call ( arguments ); function calc(){ var newArr = Array

BASH, Dihedral angle with four points

给你一囗甜甜゛ 提交于 2019-12-31 04:38:09
问题 Points: A -2.08576 1.76533 -0.46417 B -0.95929 0.87554 0.03365 C 0.28069 1.66193 0.42640 D 0.62407 2.22927 -0.44649 So far, I have done: #!/bin/bash awk 'NR==1' $FILE > LINEA awk 'NR==1' $FILE > LINEB awk 'NR==1' $FILE > LINEC awk 'NR==1' $FILE > LINED x1=`awk '{print $2}' LINEA` # x1 y1=`awk '{print $3}' LINEA` # y1 z1=`awk '{print $4}' LINEA` # z1 x2=`awk '{print $2}' LINEB` # x2 y2=`awk '{print $3}' LINEB` # y2 z2=`awk '{print $4}' LINEB` # z2 x3=`awk '{print $2}' LINEC` # x3 y3=`awk '

匿名函数

倾然丶 夕夏残阳落幕 提交于 2019-12-29 11:33:12
匿名函数就是不需要显式的指定函数 #这段代码 def calc(n): return n**n print(calc(10)) #换成匿名函数 calc = lambda n:n**n #n为匿名函数的形参 n**n匿名函数的返回值 print(calc(10)) 匿名函数主要是和其它函数搭配使用的呢,如下: l=[3,2,100,999,213,1111,31121,333] print(max(l)) dic={'k1':10,'k2':100,'k3':30} print(max(dic)) print(dic[max(dic,key=lambda k:dic[k])]) res = map(lambda x:x**2,[1,5,7,4,8]) for i in res: print(i) 输出 1 25 49 16 64 来源: https://www.cnblogs.com/hui147258/p/10855883.html

6 匿名函数

吃可爱长大的小学妹 提交于 2019-12-29 11:32:16
匿名函数 (lambda)就是不需要显式的指定函数名 def calc(x,y): return x**y print(calc(2,5)) #换成匿名函数 calc = lambda x,y:x**y print(calc(2,5)) 和 map()函数 一起使用 res1 = map(lambda x:x**2,[1,5,7,8]) for i in res1: print(i) # 输出 1 25 49 64 和 filter()函数 一起使用 res2 = filter(lambda x:x%2,[i for i in range(1,11)]) for i in res2: print(i) # 输出 1 3 5 7 9 来源: https://www.cnblogs.com/shibojie/p/11658262.html

递归实现指数函数

試著忘記壹切 提交于 2019-12-28 14:20:39
#include <stdio.h> double calc_pow( double x, int n ); int main() { double x; int n; scanf("%lf %d", &x, &n); printf("%.0f\n", calc_pow(x, n)); return 0; } double calc_pow( double x, int n ) { double b=1; if(n==1)b=x; else if(n>1)b=x*calc_pow(x,n-1); else return 0; return b; } 来源: CSDN 作者: weixin_45810623 链接: https://blog.csdn.net/weixin_45810623/article/details/103742723

一个Java的Actor框架:kilim

余生长醉 提交于 2019-12-25 12:06:41
除了Akka以外,另外一个将类似Erlang和Scala的Actor的并发模型引入Java的开源框架: kilim/kilim - GitHub ,其使用了一种mailbox跨线程共享内存,没有锁或同步。 消息消费者代码如下,监听mailbox: public class Calculator extends Task{ private Mailbox<calculation> mailbox; public Calculator(Mailbox<calculation> mailbox) { super(); this.mailbox = mailbox; } @[author]Override[/author] public void execute() throws Pausable, Exception { while (true) { Calculation calc = mailbox.get(); // blocks if (calc.getAnswer() == null) { calc.setAnswer(calc.getDividend().divide(calc.getDivisor(), 8, RoundingMode.HALF_UP)); System.out.println("Calculator determined answer"); mailbox

Why calc is not reevaluated when it is used for font-size?

爷,独闯天下 提交于 2019-12-25 06:24:04
问题 I tried to use VW and calc together and works but calculated only once: loading time: http://codepen.io/anon/pen/mJOGbr html{ font-size: calc( 16px + 2vw ); } How can I force to evaluate that calc any time the browser window is resized? It is evaluated once, but never again. Without calc, the VM works fine... Thanks in advance! 回答1: Note that if you are using an older webkit browser, this problem of not-resizing may occur indeed. See this post. (Scroll to "Bugs!") The support is there in

Why calc is not reevaluated when it is used for font-size?

寵の児 提交于 2019-12-25 06:23:19
问题 I tried to use VW and calc together and works but calculated only once: loading time: http://codepen.io/anon/pen/mJOGbr html{ font-size: calc( 16px + 2vw ); } How can I force to evaluate that calc any time the browser window is resized? It is evaluated once, but never again. Without calc, the VM works fine... Thanks in advance! 回答1: Note that if you are using an older webkit browser, this problem of not-resizing may occur indeed. See this post. (Scroll to "Bugs!") The support is there in

python实现最简单的计算器功能源码

≯℡__Kan透↙ 提交于 2019-12-23 03:15:45
1 import re 2 3 4 def calc(formula): 5 formula = re.sub(' ', '', formula) 6 formula_ret = 0 7 match_brackets = re.search(r'\([^()]+\)', formula) 8 if match_brackets: 9 calc_result = calc(match_brackets.group().strip("(,)")) 10 formula = formula.replace(match_brackets.group(), str(calc_result)) 11 return calc(formula) 12 else: 13 formula = formula.replace('--', '+').replace('++', '+').replace('-+', '-').replace('+-', '-') 14 while re.findall(r"[*/]", formula): 15 get_formula = re.search(r"[.\d]+[*/]+[-]?[.\d]+", formula) 16 if get_formula: 17 get_formula_str = get_formula.group() 18 if get

CSS - Use calc() to keep widths of elements the same

笑着哭i 提交于 2019-12-21 07:55:02
问题 Is something like this possible in CSS? <table> <tr> <td id="elementOne">elementOne</td> <td id="elementtwo">elementtwo</td> </tr> </table> <div style="width: calc(document.getElementById(elementOne).width)"></div> So that the div is always the same width as elementOne . Is there such a feature in CSS, using calc() or some other means? 回答1: No, it's not possible with CSS. For that you will have to use JavaScript ( document.getElementById(elementOne).offsetWidth or similar, depending on