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What are the special dollar sign shell variables?
... harming'
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answered Mar 2 '11 at 4:04
kojirokojiro
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In CMake, how can I test if the compiler is Clang?
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what does -webkit-transform: translate3d(0,0,0); exactly do? Apply to body?
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regex for zip-code
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^\d{5}(?:[-\s]\d{4})?$
^ = Start of the string.
\d{5} = Match 5 digits (for condition 1, 2, 3)
(?:…) = Grouping
[-\s] = Match a space (for condition 3) or a hyphen (for condition 2)
\d{4} = Match 4 digits (for condition 2, 3...
Assign multiple columns using := in data.table, by group
...1 hi hello
# 2: 2 2 hi hello
# 3: 3 3 hi hello
# 4: 1 4 hi hello
# 5: 2 5 hi hello
# 6: 3 6 hi hello
x[ , c("mean", "sum") := list(mean(b), sum(b)), by = a][]
# a b col1 col2 mean sum
# 1: 1 1 hi hello 2.5 5
# 2: 2 2 hi hello 3.5 7
# 3: 3 3 hi hello 4.5 9
# 4: 1 4 h...
How to compare strings ignoring the case
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.NET 4.0 has a new GAC, why?
...new GAC . Does it mean now we have to manage two GACs, one for .NET 2.0-3.5 applications and the other for .NET 4.0 applications?
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Why does 0.ToString(“#.##”) return an empty string instead of 0.00 or at least 0?
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Is 0 a decimal literal or an octal literal?
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
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[1,2,3,4,5,6][1,2,3];
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array + — array subscript access operation,
where index is `1,2,3`,
which is an expression that evaluates to `3`.
The seco...