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Assign multiple columns using := in data.table, by group
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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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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e.html
CMake使用步骤：
运行GUI的cmake界面：
cmake-2.8.1-win32-x86/bin/cmake-gui.exe
执行Configure：
运行之后，生成了如下文件：
生成Makefile：
执行Generate之后生成如下文件：
运行make进行编译：
编译完成后，在build目录生成Tut...
How to generate random number with the specific length in python
Let say I need a 3 digit number, so it would be something like:
8 Answers
8
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How to get certain commit from GitHub project
...d the latest source code. In this case, I need an older commit: 91f256424531030a454548693c3a6ca49ca3f35a , but I have no idea how to get the entire project from that commit...
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How to change the commit author for one specific commit?
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3731
Interactive rebase off of a point earlier in the history than the commit you need to modify (...
How do I resolve git saying “Commit your changes or stash them before you can merge”?
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1382
You can't merge with local modifications. Git protects you from losing potentially important c...
What's the best way to check if a file exists in C?
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edited Feb 6 '15 at 13:07
gsamaras
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an...
What's the equivalent of Java's Thread.sleep() in Objective-C/Cocoa?
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Pang
8,2181717 gold badges7373 silver badges111111 bronze badges
answered May 6 '09 at 13:07
smorgansmorgan
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How do you validate a URL with a regular expression in Python?
...n and have been beating my head against the following problem for the past 3 days.
12 Answers
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How to include another XHTML in XHTML using JSF 2.0 Facelets?
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423
<ui:include>
Most basic way is <ui:include>. The included content must be placed ins...