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How to swap keys and values in a hash
...f the hash are already arrays, you can do:
> hash={ "A" => [14, 15, 16], "B" => [17, 15], "C" => [35, 15] }
> hash.each_with_object(Hash.new { |h,k| h[k]=[] }) {|(k,v), h|
v.map {|t| h[t] << k}
}
=> {14=>["A"], 15=>["A", "B", "C"], 16=>["...
error: ‘NULL’ was not declared in this scope
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answered Nov 30 '11 at 14:16
Seppo EnarviSeppo Enarvi
2,45722 gold badges2525 silver badges2323 bronze badges
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Cross Browser Flash Detection in Javascript
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16 Answers
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Is there a better way to find out if a local git branch exists?
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answered Mar 2 '11 at 16:15
Mark LongairMark Longair
358k6565 gold badges384384 silver badges314314 bronze badges
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Transitions with GStreamer Editing Services freezes, but works OK without transitions
...003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 45.2525 4.66231 44...
Add unique constraint to combination of two columns
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answered Aug 18 '16 at 15:21
Tony L.Tony L.
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Do I use , , or for SVG files?
... free alternative.
– Neonit
Dec 13 '16 at 10:03
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show 20 more comments
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List distinct values in a vector in R
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169
Do you mean unique:
R> x = c(1,1,2,3,4,4,4)
R> x
[1] 1 1 2 3 4 4 4
R> unique(x)
[1] ...
Linux command: How to 'find' only text files?
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How do I revert an SVN commit?
...rce required. No dice.
– 2rs2ts
Apr 16 '14 at 19:46
27
@2rs2ts looks like you forgot the trailing...