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Grouping functions (tapply, by, aggregate) and the *apply family

...hat beginning useRs may have difficulty deciding which one is appropriate for their situation or even remembering them all. They may have a general sense that "I should be using an *apply function here", but it can be tough to keep them all straight at first. Despite the fact (noted in other answer...
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“No newline at end of file” compiler warning

What is the reason for the following warning in some C++ compilers? 11 Answers 11 ...
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Sort NSArray of date strings or objects

... Store the dates as NSDate objects in an NS(Mutable)Array, then use -[NSArray sortedArrayUsingSelector: or -[NSMutableArray sortUsingSelector:] and pass @selector(compare:) as the parameter. The -[NSDate compare:] method will or...
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npm install private github repositories by dependency in package.json

I'm trying to install github private repository by npm that includes other private github repositories as dependency. 10 An...
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Can constructors throw exceptions in Java?

Are constructors allowed to throw exceptions? 6 Answers 6 ...
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Can a div have multiple classes (Twitter Bootstrap) [duplicate]

...space. Also: Keep in mind some bootstrap classes are supposed to be used for the same stuff but in different cases (for example alignment classes, you might want something aligned left, right or center, but it has to be only one of them) and you shouldn't use them together, or you'd get an unexpect...
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How do I change the title of the “back” button on a Navigation Bar

...ault value is the title of the view that loaded the current one, in other words the view to be shown when the button is pressed (back button). ...
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How to print the full traceback without halting the program?

...data that can be readily used in the NumPy library. There are tons of errors this file encounters through bad links, poorly formed XML, missing entries, and other things I've yet to categorize. I initially made this program to handle errors like this: ...
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Concurrent HashSet in .NET Framework?

... Your implementation is correct. The .NET Framework does not provide a built-in concurrent hashset type, unfortunately. However, there are some workarounds. ConcurrentDictionary (recommended) This first one is to use the class ConcurrentDictionary...
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Google Guava isNullOrEmpty for collections

I see that Guava has isNullOrEmpty utility method for Strings 7 Answers 7 ...