大约有 40,000 项符合查询结果（耗时：0.0458秒） [XML]
Print function log /stack trace for entire program using firebug
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How to set the UITableView Section title programmatically (iPhone/iPad)?
...ITableView in Interface Builder using storyboards . The UITableView is setup with static cells and a number of different sections.
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How do I return NotFound() IHttpActionResult with an error message or exception?
... Request = request;
}
public string Message { get; private set; }
public HttpRequestMessage Request { get; private set; }
public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
{
return Task.FromResult(Execute());
}
pub...
For each row return the column name of the largest value
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One option using your data (for future reference, use set.seed() to make examples using sample reproducible):
DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
A faster solution than using apply might be max.col:
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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
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Since POSIX doesn't define the behavior of [ with complex sets of tests, we should avoid using -a or -o with [. I read it here.
– jaypal singh
Jan 19 '12 at 2:35
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How do I write a short literal in C++?
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jQuery append() vs appendChild()
...ation on append method
Quoting MDN
The ParentNode.append method inserts a set of Node objects or DOMString objects after the last child of the ParentNode. DOMString objects are inserted as equivalent Text nodes.
This is not supported by IE and Edge but supported by Chrome(54+), Firefox(49+) and Op...
How do I break out of a loop in Perl?
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Group by multiple columns in dplyr, using string vector input
I'm trying to transfer my understanding of plyr into dplyr, but I can't figure out how to group by multiple columns.
9 Answ...
Why should I use an IDE? [closed]
... Additionally, an IDE is ready to use, one does not need to set up a lot of difficult things to make it productive.
– Akira Yamamoto
Jun 9 '17 at 3:53
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