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Merge multiple lines (two blocks) in Vim

I'd like to merge two blocks of lines in Vim, i.e. take lines n..m and append them to lines a..b . If you prefer a pseudocode explanation: [a[i] + b[i] for i in min(len(a), len(b))] ...
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Convert data.frame column format from character to factor

... of the variables (all numeric) #one approach it to index with the $ sign and the as.factor function mtcars$am <- as.factor(mtcars$am) #another approach mtcars[, 'cyl'] <- as.factor(mtcars[, 'cyl']) str(mtcars) # now look at the classes This also works for character, dates, integers and ot...
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In Java, is there a way to write a string literal without having to escape quotes?

... of quotation marks inside it. You could escape them all, but it's a pain, and difficult to read. 8 Answers ...
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Run a PostgreSQL .sql file using command line arguments

I have some .sql files with thousands of INSERT statements in them and need to run these inserts on my PostgreSQL database in order to add them to a table. The files are that large that it is impossible to open them and copy the INSERT statements into an editor window and run them there. I found on ...
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Vertical Text Direction

... @CrystalMiller and BTW, w3schools can be a good helper, but it is not the source/original documentation (so it can miss some things), the "official" is w3.org, or the closest, more human-readable, to it is mozilla's developer network - "MDN...
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How to find where gem files are installed

...PATHS are only used first one. Is that right? – ironsand Sep 28 '13 at 22:27 10 gem env for short...
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How to change Rails 3 server default port in develoment?

...t - do not edit anything in your gem path! It will influence all projects, and you will have a lot problems later... In your project edit script/rails this way: #!/usr/bin/env ruby # This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your appli...
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Node.js: what is ENOSPC error and how to solve?

I have a problem with Node.js and uploading files to server. For uploading files to server I use this plugin . When starting file upload to the server, Node.js process crashed and show error: ...
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Paste multiple times

..., or use v instead of x (vnoremap). Vim help file version7.txt states xmap and smap appeared in that version. – Benoit Apr 4 '17 at 6:30 ...
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How do I delete a Git branch locally and remotely?

I want to delete a branch both locally and remotely. 41 Answers 41 ...