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[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] ...
Regular expression that matches valid IPv6 addresses
...section 2.2 of rfc5952)
link-local IPv6 addresses with zone index (section 11 of rfc4007)
IPv4-Embedded IPv6 Address (section 2 of rfc6052)
IPv4-mapped IPv6 addresses (section 2.1 of rfc2765)
IPv4-translated addresses (section 2.1 of rfc2765)
IPv6 Regular Expression:
(([0-9a-fA-F]{1,4}:){7,7}[0-...
How do I make a matrix from a list of vectors in R?
...
124
One option is to use do.call():
> do.call(rbind, a)
[,1] [,2] [,3] [,4] [,5] [,6]
...
C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...为对《C++ Concurrency in Action》的中文翻译。本书是基于C++11新标准的并发和多线程编程深度指南。从std::thr 作为对《C++ Concurrency in Action》的中文翻译。
本书是基于C++11新标准的并发和多线程编程深度指南。
从std::thread、std::mutex...
Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版 - 文档下载 - 清泛网 - ...
...的赞誉
译者序
前言
致谢
第一部分 Object.ve.C简介
第1章 C，Object.ve.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...
Applying a function to every row of a table using dplyr?
...
|
edited Aug 6 '19 at 3:20
answered Jul 14 '14 at 0:20
...
Split a vector into chunks in R
... is seq_along(), split() and ceiling():
> d <- rpois(73,5)
> d
[1] 3 1 11 4 1 2 3 2 4 10 10 2 7 4 6 6 2 1 1 2 3 8 3 10 7 4
[27] 3 4 4 1 1 7 2 4 6 0 5 7 4 6 8 4 7 12 4 6 8 4 2 7 6 5
[53] 4 5 4 5 5 8 7 7 7 6 2 4 3 3 8 11 6 6 1...
Determine the data types of a data frame's columns
...se ?str(). To explore some examples, let's make some data:
set.seed(3221) # this makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
X3=letters[1:5])
@...
What is the ultimate postal code and zip regex?
...
132
There is none.
Postal/zip codes around the world don't follow a common pattern. In some count...
Filter rows which contain a certain string
...pe))
mpg cyl disp hp drat wt qsec vs am gear carb type
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 Mazda RX4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 Mazda RX4 Wag
3 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 Toyota Corolla
4 21.5 4 120.1 ...