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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
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edited Jun 20 at 9:12
Community♦
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answered Sep 10 '12 at 14:41
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How to frame two for loops in list comprehension python
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The best way to remember this is that the order of for loop inside the list comprehension is bas...
UIPopovercontroller dealloc reached while popover is still visible
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UIPopoverControllers should always be held in an instance variable. It is a good practice to cr...
How to get a property value based on the name
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answered Apr 1 '11 at 0:45
Matt GreerMatt Greer
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Why doesn't C# support the return of references?
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This question was the subject of my blog on June 23rd 2011. Thanks for the great question!
The C# team is considering this for C# 7. See https://github.com/dotnet/roslyn/issues/5233 for details.
UPDATE: The feature made it in to C# 7!
You are correct; .NET does support metho...
In Python, how do you convert seconds since epoch to a `datetime` object?
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datetime.datetime.fromtimestamp will do, if you know the time zone, you could produce the same o...
How do I revert master branch to a tag in git?
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You can do
git checkout master
git reset --hard tag_ABC
git push --force origin master
Please...
How to get CSS to select ID that begins with a string (not in Javascript)?
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edited Jun 30 '15 at 11:53
answered Jul 15 '12 at 23:58
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Inserting a Link to a Webpage in an IPython Notebook
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edited May 16 '18 at 10:17
bfontaine
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answe...
9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...p发来的包丢弃：
BLOCK_THIS_IP="x.x.x.x"
iptables -A INPUT -i eth0 -p tcp -s "$BLOCK_THIS_IP" -j DROP
以上命令设置将由x.x.x.x ip发往eth0网口的tcp包丢弃。
4.配置服务项
利用iptables，我们可以对日常用到的服务项进行安全管理，比如设定只能...