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Find region from within an EC2 instance
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28 Answers
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Test if a vector contains a given element
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521
Both the match() (returns the first appearance) and %in% (returns a Boolean) functions are desi...
How to count total lines changed by a specific author in a Git repository?
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Regular expression to match URLs in Java
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edited Sep 29 '13 at 20:09
Alan Moore
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Check whether number is even or odd
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204
You can use the modulus operator, but that can be slow. If it's an integer, you can do:
if ( ...
Scala list concatenation, ::: vs ++
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325
Legacy. List was originally defined to be functional-languages-looking:
1 :: 2 :: Nil // a lis...
Get the week start date and week end date from week number
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162
You can find the day of week and do a date add on days to get the start and end dates..
DATEADD...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
...must be converted to a string:
require 'date'
DateTime.strptime("1318996912",'%s')
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TypeScript sorting an array
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answered Feb 10 '14 at 21:08
SLaksSLaks
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How can I use numpy.correlate to do autocorrelation?
... result = numpy.correlate(x, x, mode='full')
return result[result.size/2:]
You will, of course, need error checking to make sure that x is actually a 1-d array. Also, this explanation probably isn't the most mathematically rigorous. I've been throwing around infinities because the definition o...