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What does .SD stand for in data.table in R
... , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1: 1 a1_b3_c5
# 2: 3 a2_b4_c6
Basically, the by=y statement breaks the original data.table into these two sub-data.tables
DT[ , print(.SD), by=y]
# <1st sub-data.table, called '.SD' while it's being operated on>
# x v
...
How to only get file name with Linux 'find'?
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0m00.93s real 0m00.17s user 0m00.85s system
139
0m00.88s real 0m00.12s user 0m00.75s system
xargs's parallelism also helps.
Funnily enough i cannot explain the last case of xargs without -n1.
It gives the correct result and it's the fastest ¯\_(ツ)_/¯
(basename t...
F12 no longer works in Visual Studio
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Yury KozlovYury Kozlov
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Using multiple delimiters in awk
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ThorThor
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add a co...
visual studio not remembering open documents & startup project
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David Ferenczy Rogožan
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answered Jul 16 '11 at 5:48
Dan FDan F
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Convert Float to Int in Swift
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user3675131user3675131
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Private properties in JavaScript ES6 classes
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AlisterAlister
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Where is the WPF Numeric UpDown control?
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Evgeniy Berezovsky
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answered May 2 '10 at 5:32
MichaelMichael
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Format output string, right alignment
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Michael Mior
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answered Nov 22 '11 at 22:06
Mark ByersMark Byer...
Get child node index
...oesn't know block scoping, so i will be accesible.
– A1rPun
Sep 22 '14 at 15:12
3
@nepdev That wo...