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Pass column name in data.table using variable [duplicate]
...list(x, v))
DT[ , eval(temp)]
# x v
# 1: b 1.52566586
# 2: b 0.66057253
# 3: b -1.29654641
# 4: a -1.71998260
# 5: a 0.03159933
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jumpserver-华为云免费堡垒机解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...irrors.163.com/centos/6.7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
wget http://mirrors.163.com/centos/6.7/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm
3.进行安装yum
rpm -ivh python*
rpm -ivh yum*
注意最后两个包必需同时安装，否...
AWS S3 copy files and folders between two buckets
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answered Sep 12 '13 at 10:45
LaykeLayke
43.6k1010 gold badges7575 silver badges108108 bronze badges
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What is the correct MIME type to use for an RSS feed?
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edited Dec 24 '10 at 11:06
answered Feb 27 '09 at 16:58
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How to remove MySQL root password [closed]
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answered Jun 13 '10 at 11:54
DarioDario
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PHPMyAdmin Default login password [closed]
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In Version 4.0.6 Default username is still : root But default password is changed to : password
– ram
Sep 16 '13 at 8:34
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Casting vs using the 'as' keyword in the CLR
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The answer below the line was written in 2008.
C# 7 introduced pattern matching, which has largely replaced the as operator, as you can now write:
if (randomObject is TargetType tt)
{
// Use tt here
}
Note that tt is still in scope after this, but not definit...
How to get nice formatting in the Rails console
...l provided, however it
was completely removed with the release of Ruby 2.0.0.
For rails 4/ruby 2 you could use just
puts object.to_yaml
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How do I test if a string is empty in Objective-C?
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30 Answers
30
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How can I position my div at the bottom of its container?
...Assign position:relative to #container, and then position:absolute; bottom:0; to #copyright.
#container {
position: relative;
}
#copyright {
position: absolute;
bottom: 0;
}
<div id="container">
<!-- Other elements here -->
<div id="copyright">
...