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What does .SD stand for in data.table in R
...e119', '#0082c8', '#f58231', '#911eb4',
'#46f0f0', '#f032e6', '#d2f53c', '#fabebe', '#008080', '#e6beff',
'#aa6e28', '#fffac8', '#800000', '#aaffc3')
par(oma = c(2, 0, 0, 0))
sapply(models, function(rhs) {
# using ERA ~ . and data = .SD, then varying which
# columns are in...
Why does Java switch on contiguous ints appear to run faster with added cases?
...OfTen@-1 (line 56)
0x000000000287fe2c: cmp edx,0x13
0x000000000287fe2f: jae 0x000000000287fe46
0x000000000287fe31: movsxd r10,edx
0x000000000287fe34: shl r10,0x3
0x000000000287fe38: movabs r8,0x287fd70 ; {section_word}
0x000000000287fe42: jmp QWORD PTR [r8+r10*1] ;*t...
JavaScript + Unicode regexes
...\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u...
What is the maximum length of a URL in different browsers?
...YU1JDlTOZpjLseY5mEdKqeSD1RZqWjWWoVRYe3yxnPEsl6/KojvaMfbg/Nsp2olUEnTpRyxHGvl2FfLleLjVTQqszEAAG5hJpjVBZr8ZLJlvzqbZ88Ytq7MmLhmuXH6TXH1RYHrjnxY82LH2tnWyfx8ozlKMpaiv6o0gqKmpmkXlODLAI2oARfrv6oXaO0BV6KqneSFm0z3xBiQcIzBuAeUBlsi+VE6TQU7OfBXM2tdjuivUWl6ytXEjLJlsMlWWJj2OwsznCMtwEel0WN9Ph7afo4d+f9ObM1OV+RRPqzpq...
How to detect a Christmas Tree? [closed]
...or<Point> > contours;
Moments m;
Rect boundrect;
Point2f center;
double radius, max_area=0,tmp_area=0;
unsigned int j, k;
int i;
for(i = 1; i < argc; ++i)
{
original = imread(argv[i]);
if(original.empty())
{
cerr <&l...
What exactly does git's “rebase --preserve-merges” do (and why?)
...01, commit 4c68e7d, commit 9055e40, commit cb5206e, commit a01c2a5, commit 2f6b1d1, commit bf5c057 (25 Apr 2018) by Johannes Schindelin (dscho).
See commit f431d73 (25 Apr 2018) by Stefan Beller (stefanbeller).
See commit 2429335 (25 Apr 2018) by Phillip Wood (phillipwood).
(Merged by Junio C Hamano...
最新版AI伴侣测试历程 - HarmonyOS NEXT - 清泛IT社区，为创新赋能！
[6:37:16 PM] I/[YAIL] begin: 2 个子表达式
[6:37:16 PM] I/[YAIL] begin[1]: (require) len=2
[6:37:16 PM] I/[YAIL] begin[2]: (process-repl-input) len=3
[6:37:16 PM] I/[YAIL] begin: 1 个子表达式
[6:37:16 PM] I/[YAIL] begin[1]: (define-event) len=6
[6:37:16 PM] I/[YAIL] ...
Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版 - 文档下载 - 清泛网 - ...
...C的基础
1.1. C程序的结构
1.1.1. main函数
1.1.2 格式化
1.1.3 注释
1.1.4 变量和函数名
1.1.5 命名惯例
1.1.6 文件
1.2 变量
1.2.1. 整数类型
1.2.2 浮点类型
1.2.3 真值
1.2.4 初始化
1.2.5 指针
1.2.6 数组
1.2.7 字符串
1.2.8 结构
1.2.9 typede...
C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...并发… 1
1.1.1 计算机系统的并发… 1
1.1.2 并发的方法… 3
1.2 为什么使用并发… 4
1.2.1 因划分重点而使用并发… 5
1.2.2 为了提高性能而使用并发… 5
1.2.3 什么时候不使用并发… 6
1.3 在C++中使用并发和多线程… 7
1.3.1 多线程...
Regular expression that matches valid IPv6 addresses
...
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