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

... Moody_MudskipperMoody_Mudskipper 35.7k99 gold badges6969 silver badges106106 bronze badges ...
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What is the difference between URI, URL and URN? [duplicate]

... Nisse Engström 4,46499 gold badges2323 silver badges3737 bronze badges answered Feb 6 '11 at 12:46 ayushayush ...
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Is there any async equivalent of Process.Start?

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Is gcc std::unordered_map implementation slow? If so - why?

... 10000000 #define DEPTH 3 std::vector<uint64_t> vec(SIZE); boost::mt19937 rng; boost::uniform_int<uint64_t> dist(std::numeric_limits<uint64_t>::min(), std::numeric_limits<uint64_t>::max()); std::unordered_map<int, long double> map(SIZE/...
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What happens if you static_cast invalid value to enum class?

... maximum value storable is required to be at least 127 per Annex E of the C99 Standard. Compare to [expr]/4 If during the evaluation of an expression, the result is not mathematically defined or not in the range of representable values for its type, the behavior is undefined. Before CWG 176...
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In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli

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What are the differences between Abstract Factory and Factory design patterns?

... Pietro Di Bello 32322 silver badges99 bronze badges answered Apr 21 '11 at 5:48 jgauffinjgauffin 93.4k4141 gold b...
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Isn't it silly that a tiny favicon requires yet another HTTP request? How can I put the favicon into

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Efficient evaluation of a function at every cell of a NumPy array

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Best Practice for Exception Handling in a Windows Forms Application?

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