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How to select only the first rows for each unique value of a column

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Remove duplicated rows using dplyr

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GCC dump preprocessor defines

...cause (the non C++) gcc will never support "Templates Aliases" (see http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf) you must add the -x c++ option to force the invocation of the C++ compiler (Credits for using the -x c++ options instead of an empty dummy file go to yuyichao, see b...
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How do I reference a Django settings variable in my models.py?

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How can I dynamically add a directive in AngularJS?

...mpileFunction($scope); More details with full code samples here: http://www.learn-angularjs-apps-projects.com/AngularJs/dynamically-add-directives-in-angularjs share | improve this answer ...
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R data formats: RData, Rda, Rds etc

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is there any way to force copy? copy without overwrite prompt, using windows?

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jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON

...de of a string, since \' is undefined by the spec, use \u0027 see http://www.utf8-chartable.de/ for all of them edit: please excuse my misuse of the word backticks in the comments. I meant backslash. My point here is that in the event you have nested strings inside other strings, I think it can...
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Where is the documentation for the values() method of Enum?

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What does Class mean in Java?

...flection (the feature of Java language used to introspect itself): https://www.oracle.com/technetwork/articles/java/javareflection-1536171.html share | improve this answer | ...