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Conditionally Remove Dataframe Rows with R [duplicate]

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What is the difference between JOIN and JOIN FETCH when using JPA and Hibernate

Please help me understand where to use a regular JOIN and where a JOIN FETCH. 5 Answers ...
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How can I output the value of an enum class in C++11

How can I output the value of an enum class in C++11? In C++03 it's like this: 7 Answers ...
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Repeating characters in VIM insert mode

Is there a way of repeating a character while in Vim's insert mode? For example, say I would like to insert 80 dashes, in something like emacs I would type: ...
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Why does flowing off the end of a non-void function without returning a value not produce a compiler

Ever since I realized many years ago, that this doesn't produce an error by default (in GCC at least), I've always wondered why? ...
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Using ConfigurationManager to load config from an arbitrary location

I'm developing a data access component that will be used in a website that contains a mix of classic ASP and ASP.NET pages, and need a good way to manage its configuration settings. ...
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Laravel 4 Eloquent Query Using WHERE with OR AND OR?

How do I say WHERE (a = 1 OR b =1 ) AND (c = 1 OR d = 1) 11 Answers 11 ...
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Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]

...is better: void foo() or void foo(void) ? With void it looks ugly and inconsistent, but I've been told that it is good. Is this true? ...
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How do I get a list of all the duplicate items using pandas in python?

...hat likely has some export issues. I would like to get a list of the duplicate items so I can manually compare them. When I try to use pandas duplicated method , it only returns the first duplicate. Is there a a way to get all of the duplicates and not just the first one? ...
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Get Slightly Lighter and Darker Color from UIColor

I was looking to be able to turn any UIColor into a gradient. The way I am intending to do this is by using Core Graphics to draw a gradient. What I am trying to do is to get a color, lets say: ...