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How to rename a single column in a data.frame?
I know if I have a data frame with more than 1 column, I can use
20 Answers
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Appending a line to a file only if it does not already exist
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Beautiful solution. This also works for triggering more complicated expressions, of course. Mine uses the echo to trigger a cat of a multiline heredoc into a config file.
– Eric L.
Jun 15 '15 at 16:10
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Calling a function every 60 seconds
...e queued. This means that your callback may (and probably will) fire after more than 60 seconds.
– Andy E
Jun 29 '10 at 7:52
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Utilizing multi core for tar+gzip/bzip compression/decompression
... of available cores, or eight if it could not query that. You can ask for more with -p n, e.g. -p 32. pigz has the same options as gzip, so you can request better compression with -9. E.g.
tar cf - paths-to-archive | pigz -9 -p 32 > archive.tar.gz
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android image button
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Please justify and descrive more about android:background!
– Emad Aghayi
Apr 15 '15 at 10:58
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Controlling fps with requestAnimationFrame?
...mp feature. The new rAF timestamp adds useful infrastruction and it's also more precise than Date.now.
– markE
Jul 22 '14 at 19:57
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PHP array: count or sizeof?
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I would use count() if they are the same, as in my experience it is more common, and therefore will cause less developers reading your code to say "sizeof(), what is that?" and having to consult the documentation.
I think it means sizeof() does not work like it does in C (calculating the siz...
How to merge two sorted arrays into a sorted array? [closed]
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answer[k++] = b[j++];
return answer;
}
Is a little bit more compact but exactly the same!
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:: (double colon) operator in Java 8
...tically equal, so the last two can be considered to be short (and probably more efficient) versions of the IntBinaryOperator implementation above!
(See also Translation of Lambda Expressions)
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