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Assign multiple columns using := in data.table, by group
...hat is the best way to assign to multiple columns using data.table ? For example:
2 Answers
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Shorter syntax for casting from a List to a List?
...tems from one type to another (given that your object has a public static explicit operator method to do the casting) one at a time as follows:
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How do I syntax check a Bash script without running it?
Is it possible to check a bash script syntax without executing it?
8 Answers
8
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Find the files existing in one directory but not in the other [closed]
I'm trying to find the files existing in one directory but not in the other, I tried to use this command:
14 Answers
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Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...有一块不能用 ，太TM的坑爹了
查看阵列卡的配置 我X 缓存0M 你奶奶的配置什么3块硬盘啊，你这么搞IBM造吗？
物尽其用 第三块盘 配置成全局热备盘。
选择 配置 然后GO
全局热备 MAKE GLOBAL HSP
最后就是酱紫的...
Location of my.cnf file on macOS
...L. The problem is, where should my.cnf file be located? I'm using Mac OS X Lion.
30 Answers
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Swift: Testing optionals for nil
I'm using Xcode 6 Beta 4. I have this weird situation where I cannot figure out how to appropriately test for optionals.
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What should I set JAVA_HOME environment variable on macOS X 10.6?
...rences. Here's a snippet from my .bashrc file, which sets this variable:
export JAVA_HOME=$(/usr/libexec/java_home)
I haven't experienced any problems with that technique.
Occasionally I do have to change the value of JAVA_HOME to an earlier version of Java. For example, one program I'm maintain...
What is the pythonic way to detect the last element in a 'for' loop?
...nerally superior solution as it depends on what you are trying to do. For example, if you are building a string from a list, it's naturally better to use str.join() than using a for loop “with special case”.
Using the same principle but more compact:
for i, line in enumerate(data_list):
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How to get a user's client IP address in ASP.NET?
... address in ASP.NET, but this is usually the user's ISP's IP address, not exactly the user's machine IP address who for example clicked a link. How can I get the real IP Address?
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