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Mean per group in a data.frame [duplicate]
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A third great alternative is using the package data.table, which also has the class data.frame,...
How to quickly open a file in Visual Studio 2012
I am trying VS2012 RC but find one good feature no available any more (or if it still is, please let me know): in VS2010, if I know a file name, for example, MyFile.cs , I can quickly open it by typing Ctrl + D (or whatever shortcut assigned) to go to Find tool, and then type >of myfile.cs , ...
In a Bash script, how can I exit the entire script if a certain condition occurs?
...s to a login prompt.
– Engineer
Mar 20 '19 at 20:00
5
@ToniLeigh If it's closing the "window" lik...
Is it a good practice to use an empty URL for a HTML form's action attribute? (action=“”)
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Jul 15 '09 at 15:10
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What does a double * (splat) operator do
...a, b, c]
end
Here's a demo:
> foo 10
=> [10, [], {}]
> foo 10, 20, 30
=> [10, [20, 30], {}]
> foo 10, 20, 30, d: 40, e: 50
=> [10, [20, 30], {:d=>40, :e=>50}]
> foo 10, d: 40, e: 50
=> [10, [], {:d=>40, :e=>50}]
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How to copy a file to multiple directories using the gnu cp command
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answered Oct 12 '08 at 20:15
Robert GambleRobert Gamble
94.3k2121 gold badges139139 silver badges135135 bronze badges
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Use CSS to automatically add 'required field' asterisk to form inputs
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edited Dec 20 '19 at 2:25
abranhe
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How can I test that a value is “greater than or equal to” in Jasmine?
... is not a Number (NaN).
– Rohit
Feb 20 '18 at 10:32
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How do I schedule jobs in Jenkins?
...y day at 8h00, this will do the job : 0 8 * * *
For the past few versions (2014), Jenkins have a new parameter, H (extract from the Jenkins code documentation):
To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should be used wherever possible.
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Convert normal date to unix timestamp
How can I convert normal date 2012.08.10 to unix timestamp in javascript?
11 Answers
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