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Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...分别是Alfred Aho、Brian Kernighan、Peter Weinberger。gawk是awk的GNU本,它提供了Bell实验室和GNU的一些扩展。下面介绍的awk是以GUN的gawk为例的,在linux系统中已把awk链接到gawk,所以下面全部以awk进行介绍。 2. awk命令格式和选项 ...
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术

...等等。至此,一个RTD Server的生命周期就结束了。 一 C#实例 来源:http://www.cnblogs.com/makemelaugh/archive/2008/11/06/1327960.html 创建一个项目ExcelRTD,添加Microsoft.Office.Interop.Excel引用。创建一个类MarketData.cs,这个类继承IRtdServer接口...
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...e 30 Minute Regex Tutorial。由于评论里有过长的URL,所以本页排比较... 来园子之前写的一篇正则表达式教程,部分翻译自codeproject的The 30 Minute Regex Tutorial。 由于评论里有过长的URL,所以本页排比较混乱,推荐你到原处...
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C++并发编程(中文) - 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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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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Summarizing multiple columns with dplyr? [duplicate]

...df %>% group_by(grp) %>% summarise_all(list(mean)) #> # A tibble: 3 x 5 #> grp a b c d #> <int> <dbl> <dbl> <dbl> <dbl> #> 1 1 3.08 2.98 2.98 2.91 #> 2 2 3.03 3.04 2.97 2.87 #> 3 3 2.85 2.95 2.95 3.06...
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Calculate difference in keys contained in two Python dictionaries

... 234 You can use set operations on the keys: diff = set(dictb.keys()) - set(dicta.keys()) Here is...
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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]) ...
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PHP Pass by reference in foreach [duplicate]

...ee'); foreach ($a as &$v) { } foreach ($a as $v) { echo $v.'-'.$a[3].PHP_EOL; } As you can see, the last array item takes the current loop value: 'zero', 'one', 'two', and then it's just 'two'... : ) share ...
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Regular expression that matches valid IPv6 addresses

... 30 Answers 30 Active ...