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How to move one word left in the vi editor

... Use b to move back one word. Use w to move forward one word. And here is a cheat sheet that might be useful for you: Source: Graphical vi-vim Cheat Sheet and Tutorial ...
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Compare if two variables reference the same object in python

How to check whether two variables reference the same object? 6 Answers 6 ...
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Apply a function to every row of a matrix or a data frame

Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R? ...
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Finding ALL duplicate rows, including “elements with smaller subscripts”

...nt of a vector or data frame is a duplicate of an element with a smaller subscript. So if rows 3, 4, and 5 of a 5-row data frame are the same, duplicated will give me the vector ...
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EF Migrations: Rollback last applied migration?

This looks like a really common task, but I can't find an easy way to do it. 14 Answers ...
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Code Golf: Lasers

The shortest code by character count to input a 2D representation of a board, and output 'true' or 'false' according to the input . ...
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What is a lambda expression in C++11?

What is a lambda expression in C++11? When would I use one? What class of problem do they solve that wasn't possible prior to their introduction? ...
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Is there a better way to express nested namespaces in C++ within the header

...from C++ to Java and C# and think the usage of namespaces/packages is much better there (well structured). Then I came back to C++ and tried to use namespaces the same way but the required syntax is horrible within the header file. ...
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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.

Let's say I have the following data.table in R : 3 Answers 3 ...
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Xcode 6 iPhone Simulator Application Support location

In Xcode 6, I have an app I'm using Core Data in, but there is no folder in Application Support for the iOS 8 iPhone Simulator. Where are my files and Core Data sqlite database being stored? ...