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Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注C/C++及内核技术

...行交易程序时,由于银行的交易程序基本一样,就见到有书写了一些交易的通用程序模板,在该模板中把一些网络通讯、数据库操作的、业务操作共性的东西写在一个文件中,在这些文件中用些诸如"@@@N、###N"奇怪字串标注一...
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Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注C/C++及内核技术

...行交易程序时,由于银行的交易程序基本一样,就见到有书写了一些交易的通用程序模板,在该模板中把一些网络通讯、数据库操作的、业务操作共性的东西写在一个文件中,在这些文件中用些诸如"@@@N、###N"奇怪字串标注一...
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Makefile经典教程(入门必备) - C/C++ - 清泛网移动版 - 专注C/C++及内核技术

...行交易程序时,由于银行的交易程序基本一样,就见到有书写了一些交易的通用程序模板,在该模板中把一些网络通讯、数据库操作的、业务操作共性的东西写在一个文件中,在这些文件中用些诸如"@@@N、###N"奇怪字串标注一...
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Regular expression that matches valid IPv6 addresses

... 30 Answers 30 Active ...
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How do I make a matrix from a list of vectors in R?

...ne option is to use do.call(): > do.call(rbind, a) [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 1 2 3 4 5 [2,] 2 1 2 3 4 5 [3,] 3 1 2 3 4 5 [4,] 4 1 2 3 4 5 [5,] 5 1 2 3 4 5 [6,] 6 1 2 3 ...
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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...
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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 countr...
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Filter rows which contain a certain string

... 263 The answer to the question was already posted by the @latemail in the comments above. You can us...
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Assign multiple columns using := in data.table, by group

... This now works in v1.8.3 on R-Forge. Thanks for highlighting it! x <- data.table(a = 1:3, b = 1:6) f <- function(x) {list("hi", "hello")} x[ , c("col1", "col2") := f(), by = a][] # a b col1 col2 # 1: 1 1 hi hello # 2: 2 2 hi hello ...
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Determine the data types of a data frame's columns

...o use ?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]) ...