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Extracting specific columns from a data frame
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.
10 Answers
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vs2008编译boost详细步骤 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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（10）smart_ptr，智能指针。
【二、Boost库的编译】
【Setp1 准备工作】：
（1）Boost 下载可以到官方网站下载：
http://www.boost.org/
（2）安装VS2008 IDE
【Setp2 编译Boost】
1.打开Visual Studio 2008 命令提示窗口
2.进入D:\05_Computer...
Didn't Java once have a Pair class? [duplicate]
... incorrectly, or did Java, once upon a time, provide a Pair class as part of its API?
10 Answers
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Which regular expression operator means 'Don't' match this character?
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Modulo operator with negative values [duplicate]
Why do such operations:
3 Answers
3
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Can I call memcpy() and memmove() with “number of bytes” set to zero?
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How to index characters in a Golang string?
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SSL certificate rejected trying to access GitHub over HTTPS behind firewall
...We use a tool called corkscrew. This is available for both CygWin (through setup from the cygwin homepage) and Linux using your favorite packaging tool. For MacOSX it is available from macports and brew at least.
The commandline is as follows :
$ corkscrew <proxyhost> <proxyport> <t...
Calculating Pearson correlation and significance in Python
I am looking for a function that takes as input two lists, and returns the Pearson correlation , and the significance of the correlation.
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Any way to limit border length?
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The :after rocks :)
If you play a bit you can even set your resized border element to appear centered or to appear only if there is another element next to it (like in menus). Here is an example with a menu:
#menu > ul > li {
position: relative;
float: left;
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