大约有 40,000 项符合查询结果（耗时：0.0484秒） [XML]
List files committed for a revision
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List distinct values in a vector in R
...If it's not a factor, but it should be, you can convert it to factor first by using the factor() function, e.g.
levels( factor( data$product_code ) )
Another option, as mentioned above, is the unique() function:
unique( data$product_code )
The main difference between the two (when applied to a...
Insert text with single quotes in PostgreSQL
...
String literals
Escaping single quotes ' by doubling them up -> '' is the standard way and works of course:
'user's log' -- incorrect syntax (unbalanced quote)
'user''s log'
In old versions or if you still run with standard_conforming_strings = off or, gene...
Python Requests - No connection adapters
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jQuery 1.9 .live() is not a function
...
You can avoid refactoring your code by including the following JavaScript code
jQuery.fn.extend({
live: function (event, callback) {
if (this.selector) {
jQuery(document).on(event, this.selector, callback);
}
return this...
Abandoning changes without deleting from history
...e closed branch if you use the -c option to hg heads, but it won't show up by default and hg merge will know not try to merge with the closed head.
You will need to use hg push --force the first time you push this closed head to another repository since you are actually create additional heads in t...
JavaScript exponents
... equal to a ** (b ** c).
For example:
2**3 // here 2 will multiply 3 times by 2 and the result will be 8.
4**4 // here 4 will multiply 4 times by 4 and the result will be 256.
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initialize a vector to zeros C++/C++11
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GitHub: What is a “wip” branch?
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On GitHub, pull requests are prefixed by [WIP] to indicate that the pull requestor
has not yet finished his work on the code (thus, work in progress), but
looks for have some initial feedback (early-pull strategy), and
wants to use the continuous integration i...
Rails: Get Client IP address
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