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Difference Between Select and SelectMany
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Graham
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answered Jun 6 '09 at 5:23
Mike TwoMike Two
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Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...。
# wget ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p174.tar.gz
# tar zxvf ruby-1.8.7-p174.tar.gz
# cd ruby-1.8.7-p174
# ./configure --prefix=/usr/local/ruby
# make && make install
设置Ruby环境变量
# cd ~
# vi .bash_profile
添...
How to activate an Anaconda environment
I'm on Windows 8, using Anaconda 1.7.5 64bit.
12 Answers
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How do pointer to pointers work in C?
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14 Answers
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How do I run Python code from Sublime Text 2?
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answered Dec 18 '11 at 13:49
matiitmatiit
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Call apply-like function on each row of dataframe with multiple arguments from each row
...y to a subset of the original data.
dat <- data.frame(x=c(1,2), y=c(3,4), z=c(5,6))
apply(dat[,c('x','z')], 1, function(x) sum(x) )
or if your function is just sum use the vectorized version:
rowSums(dat[,c('x','z')])
[1] 6 8
If you want to use testFunc
testFunc <- function(a, b) a +...
Equivalent of *Nix 'which' command in PowerShell?
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14 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
...用C++代码直接表达EBNF；
（3）Graph，图组件和算法；
（4）Lambda，在调用的地方定义短小匿名的函数对象，很实用的functional功能；
（5）concept check，检查泛型编程中的concept；
（6）Mpl，用模板实现的元编程框架；
（7）Thread，...
Regex: match everything but specific pattern
...c pattern (specifically index.php and what follows, like index.php?id=2342343 )
7 Answers
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LPCSTR, LPCTSTR and LPTSTR
...tring types in C++
– John Sibly
Jun 4 '15 at 9:15
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@JohnSibly: In C, yes. In C++, it absolutely ...