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How to reorder data.table columns (without copying)
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185
Use setcolorder():
library(data.table)
x <- data.table(a = 1:3, b = 3:1, c = runif(3))
x
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The Ruby %r{ } expression
...t
\s # white space char
(group) # first group
(?:alt1|alt2) # some alternation
end
}x
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setup cron tab to specific time of during weekdays
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177
Same as you did for hours:
*/2 09-18 * * 1-5 /path_to_script
0 and 7 stand for Sunday
6 sta...
Git merge errors
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edited May 23 '17 at 12:02
Community♦
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answered May 15 '11 at 7:23
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What do you call the -> operator in Ruby?
... lambda defined using -> is called lambda literal.
succ = ->(x){ x+1 }
succ.call(2)
The code is equivalent to the following one.
succ = lambda { |x| x + 1 }
succ.call(2)
Informally, I have heard it being called stabby lambda or stabby literal.
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SQL Server: converting UniqueIdentifier to string in a case statement
...e link where I found this info:
http://msdn.microsoft.com/en-us/library/ms187928.aspx
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What is %2C in a URL?
...--+----+-----+----+-----+
| 00 | NUL | 20 | SPC | 40 | @ | 60 | ` |
| 01 | SOH | 21 | ! | 41 | A | 61 | a |
| 02 | STX | 22 | " | 42 | B | 62 | b |
| 03 | ETX | 23 | # | 43 | C | 63 | c |
| 04 | EOT | 24 | $ | 44 | D | 64 | d |
| 05 | ENQ | 25 | % | 45 | E | 65 | e ...
How to check whether a string is Base64 encoded or not
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edited Nov 22 '18 at 8:47
Luis Colorado
6,61311 gold badge99 silver badges2525 bronze badges
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Initializing a struct to 0
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The first is easiest(involves less typing), and it is guaranteed to work, all members will be ...