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Pass column name in data.table using variable [duplicate]
In following example, I am creating a data table having column name ‘x’ and ‘v’
1 Answer
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SSH免密码登陆教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
SSH免密码登陆教程假设 A 为客户机器，B为目标机；要达到的目的：A机器ssh登录B机器无需输入密码；加密方式选 rsa|dsa均可以，默认dsa做法：1、登录A机器2...假设 A 为客户机器，B为目标机；
要达到的目的：
A机器ssh登录B机器...
【解决】标准库std::min/std::max 与 Windows.h中的宏 min/max 冲突问题 - ...
...义了 min/max 宏：
#ifndef NOMINMAX
#ifndef max
#define max(a,b) (((a) > (b)) ? (a) : (b))
#endif
#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
#endif /* NOMINMAX */
由于 Windows 头文件中的这两个函数的定义是早于 C++标...
Dependent DLL is not getting copied to the build output folder in Visual Studio
...e is added to main project.
The ProjectX references another .NET dll (say abc.dll) that isn't part of the solution.
19 Ans...
List all svn:externals recursively?
...working copy:
svn propget svn:externals -R
As discussed in the comments below, this does not list externals in externals.
Note for TortoiseSVN users: there is an option in the TortoiseSVN installer to also install the SVN command line client. This option is not enabled by default.
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What is the “hasClass” function with plain JavaScript?
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You can check whether element.className matches /\bthatClass\b/.
\b matches a word break.
Or, you can use jQuery's own implementation:
var className = " " + selector + " ";
if ( (" " + element.className + " ").replace(/[\n\t]/g, " ").indexOf(" thatClass ") > -1 )
To ...
How can I pretty-print JSON using Go?
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By pretty-print, I assume you mean indented, like so
{
"data": 1234
}
rather than
{"data":1234}
The easiest way to do this is with MarshalIndent, which will let you specify how you would like it indented via the ind...
Difference between
What is the difference between List<? super T> and List<? extends T> ?
14 Answers
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Samples of Scala and Java code where Scala code looks simpler/has fewer lines?
I need some code samples (and I also really curious about them) of Scala and Java code which show that Scala code is more simple and concise then code written in Java (of course both samples should solve the same problem).
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Encoding an image file with base64
I want to encode an image into a string using the base64 module. I've ran into a problem though. How do I specify the image I want to be encoded? I tried using the directory to the image, but that simply leads to the directory being encoded. I want the actual image file to be encoded.
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