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Convert data.frame columns from factors to characters
I have a data frame. Let's call him bob :
18 Answers
18
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DateTime vs DateTimeOffset
...s a position on someone's calendar, and there are many different calendars all over the globe. We call these calendars time zones. Calendar time is represented by a DateTime where .Kind is DateTimeKind.Unspecified, or DateTimeKind.Local. And .Local is only meaningful in scenarios where you have a...
How to get GET (query string) variables in Express.js on Node.js?
...eJS, you can access req.url and the builtin url module to url.parse it manually:
var url = require('url');
var url_parts = url.parse(request.url, true);
var query = url_parts.query;
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快速开发CSS的利器LESS 系列教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...-overflow {
display:block;/*内联对象需加*/
word-break:keep-all;/* 不换行 */
white-space:nowrap;/* 不换行 */
overflow:hidden;/* 内容超出宽度时隐藏超出部分的内容 */
text-overflow:ellipsis;/* 当对象内文本溢出时显示省略标记(...) ；需...
Why do 64-bit DLLs go to System32 and 32-bit DLLs to SysWoW64 on 64-bit Windows?
...ve it.
SysWoW64 wasn't intended for the dlls of 64-bit systems, it's actually something like "Windows on Windows64", meaning the bits you need to run 32bit apps on a 64bit windows.
This article explains a bit:
"Windows x64 has a directory System32 that contains 64-bit DLLs (sic!). Thus native p...
Query to list number of records in each table in a database
... i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
sys.allocation_units a ON p.partition_id = a.container_id
WHERE
t.NAME NOT LIKE 'dt%' AND
i.OBJECT_ID > 255 AND
i.index_id <= 1
GROUP BY
t.NAME, i.object_id, i.index_id, i.name, p.[Rows]
ORDER BY
o...
Self-references in object literals / initializers
...some kind of one time initialization of the object.
Note that you are actually assigning the return value of init() to foo, therefore you have to return this.
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How to detect if CMD is running as Administrator/has elevated privileges?
...tended your solution a bit and posted it here since that's the one I originally came across. Thanks! stackoverflow.com/questions/4051883/…
– blak3r
Jan 24 '12 at 22:48
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
... v.end(); ++it) //v is some [std] container
{
//..
}
Or, more generally,
//good : auto increases readability here
for(auto it = std::begin(v); it != std::end(v); ++it)//v could be array as well
{
//..
}
But when the type is not very well-known and infrequently used , then I think ...
Troubleshooting “Illegal mix of collations” error in mysql
...
This is generally caused by comparing two strings of incompatible collation or by attempting to select data of different collation into a combined column.
The clause COLLATE allows you to specify the collation used in the query.
For exa...