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What's the fastest way to merge/join data.frames in R?
... and merge approaches are not the same. Match is, of course, faster since it is not doing as much. In particular it never looks for duplicate keys. (continued after code)
DF1 = data.frame(a = c(1, 1, 2, 2), b = 1:4)
DF2 = data.frame(b = c(1, 2, 3, 3, 4), c = letters[1:5])
merge(DF1, DF2)
b a c...
Android Studio: Default project directory
Whenever I create a new project in Android Studio it wants to put it in a generic default folder at a location something similar to (dependent on OS - Ubuntu here):
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Vim: apply settings on files in directory
...te of the plugin way.
For several reasons:
Modelines are particularly limited: we can't set variables (that tunes other (ft)plugins, like "should the braces of the for-snippet be on a newline ?"), or call function from them (I don't limit myself to coding standards, I also set the makefile to use ...
How do I delete an exported environment variable?
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but this only works for a session, what about unsetting it definitely? or maybe searching where is the variable set, so you can go and delete it?
– eLRuLL
Apr 19 '14 at 15:35
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How do I get IntelliJ to recognize common Python modules?
I'm using IntelliJ 10 IDEA Ultimate Edition.
11 Answers
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horizontal line and right way to code it in html, css
...ed to draw a horizontal line after some block, and I have three ways to do it:
10 Answers
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How to access SOAP services from iPhone
...one SDK I was not able to find any support for accessing SOAP services, a bit of Googling lead to the conclusion that there is no support for SOAP in the iPhone SDK.
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Is it possible to animate scrollTop with jQuery?
I want to smoothly scroll down. I do not want to have to write a function for that - especially if jQuery already has one.
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How can I have linebreaks in my long LaTeX equations?
My equation is very long. How do I get it to continue on the next line rather than go off the page?
11 Answers
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Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
So I've done some work in the repository and when I'm about to commit I realize that I'm not currently on any branch.
9 Ans...