大约有 18,000 项符合查询结果(耗时:0.0249秒) [XML]

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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output

...function, empty categories are dropped by default. You can change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty categories in the result? ...
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Get size of an Iterable in Java

I need to figure out the number of elements in an Iterable in Java. I know I can do this: 10 Answers ...
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How to split strings across multiple lines in CMake?

I usually have a policy in my project, to never create lines in text files that exceed a line length of 80, so they are easily editable in all kinds of editors (you know the deal). But with CMake I get the problem that I do not know how to split a simple string into multiple lines to avoid one huge ...
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Checking if all elements in a list are unique

What is the best way (best as in the conventional way) of checking whether all elements in a list are unique? 14 Answers ...
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Why XML-Serializable class need a parameterless constructor

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How do I quickly rename a MySQL database (change schema name)?

The MySQL manual at MySQL covers this. 48 Answers 48 ...
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How exactly does __attribute__((constructor)) work?

It seems pretty clear that it is supposed to set things up. 5 Answers 5 ...
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How to install Java SDK on CentOS?

I have CentOS 5, but I don't know the steps to install Java SDK on Linux. 12 Answers ...
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Undocumented NSURLErrorDomain error codes (-1001, -1003 and -1004) using StoreKit

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How to only get file name with Linux 'find'?

I'm using find to all files in directory, so I get a list of paths. However, I need only file names. i.e. I get ./dir1/dir2/file.txt and I want to get file.txt ...