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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...y that gets modified by reference.
DT <- data.table(a = c(1, 2), b = c(11, 12))
newDT <- DT
.Internal(inspect(DT))
# @0000000003B7E2A0 19 VECSXP g0c7 [OBJ,NAM(2),ATT] (len=2, tl=100)
# @00000000040C2288 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 1,2
# @00000000040C2250 14 REALSXP g0c2 [NAM...
How to get error message when ifstream open fails
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edited Aug 11 '17 at 15:56
S.R
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What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
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icktoofay
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answered May 15 '11 at 7:39
Don StewartD...
How do I add files without dots in them (all extension-less files) to the gitignore file?
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edited May 23 '17 at 11:54
Community♦
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answered Sep 26 '13 at 9:12
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Test for multiple cases in a switch, like an OR (||)
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Community♦
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answered Jun 28 '11 at 21:58
keikei
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How to get first N elements of a list in C#?
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netadictosnetadictos
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How to increment a pointer address and pointer's value?
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answered Nov 21 '11 at 6:34
felipemaiafelipemaia
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Ruby Array find_first object?
...ethod if you wanted to return first value where block returns true
[1,2,3,11,34].detect(&:even?) #=> 2
OR
[1,2,3,11,34].detect{|i| i.even?} #=> 2
If you wanted to return all values where block returns true then use select
[1,2,3,11,34].select(&:even?) #=> [2, 34]
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Why is Cache-Control attribute sent in request header (client to server)?
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bdashbdash
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How do I set the default font size in Vim?
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edited Jun 11 '19 at 4:27
Venkataraman R
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