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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
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answered Sep 10 '12 at 14:41
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Restore file from old commit in git
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sehesehe
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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...
UIPopovercontroller dealloc reached while popover is still visible
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203
UIPopoverControllers should always be held in an instance variable. It is a good practice to cr...
CSS selector for text input fields?
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edited Sep 4 '13 at 8:08
answered Nov 6 '10 at 16:30
Al...
How to frame two for loops in list comprehension python
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160
The best way to remember this is that the order of for loop inside the list comprehension is bas...
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 format a floating number to fixed width in Python
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for x in numbers:
print "{:10.4f}".format(x)
prints
23.2300
0.1233
1.0000
4.2230
9887.2000
The format specifier inside the curly braces follows the Python format string syntax. Specifically, in this case, it consists of the followin...
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...