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Formula to determine brightness of RGB color
... → sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 ) (thanks to @MatthewHerbst) [3]
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How to empty/destroy a session in rails?
...ides.rubyonrails.org/security.html#session-expiry
– m33lky
Feb 24 '12 at 7:14
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Calculate difference between two datetimes in MySQL
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3 Answers
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Should I use document.createDocumentFragment or document.createElement
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edited Aug 3 '14 at 13:39
answered Aug 3 '10 at 14:04
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Check if value exists in Postgres array
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337
Simpler with the ANY construct:
SELECT value_variable = ANY ('{1,2,3}'::int[])
The right op...
Change from SQLite to PostgreSQL in a fresh Rails project
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
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I would suggest using the duplicated method on the Pandas Index itself:
df3 = df3[~df3.index.duplicated(keep='first')]
While all the other methods work, the currently accepted answer is by far the least performant for the provided example. Furthermore, while the groupby method is only slightly les...
How to convert a string of numbers to an array of numbers?
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39
My 2 cents for golfers:
b="1,2,3,4".split`,`.map(x=>+x)
backquote is string litteral so w...
Ignore python multiple return value
... of the tuple you wish to ignore. For instance:
def f():
return 1, 2, 3
_, _, x = f()
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Which characters need to be escaped when using Bash?
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edited May 29 '17 at 15:34
answered Nov 18 '13 at 16:47
J...