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Assign multiple columns using := in data.table, by group
... hi hello 3.5 7 14 21
# 3: 3 3 hi hello 4.5 9 18 27
# 4: 1 4 hi hello 2.5 5 10 15
# 5: 2 5 hi hello 3.5 7 14 21
# 6: 3 6 hi hello 4.5 9 18 27
x[ , get("mynames") := list(mean(b) * 4, sum(b) * 3), by = a][] # same
# a b col1 co...
Difference between subprocess.Popen and os.system
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answered Jan 27 '11 at 6:56
Jacob MarbleJacob Marble
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Template function inside template class
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answered Dec 27 '11 at 1:31
Kerrek SBKerrek SB
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How can I map True/False to 1/0 in a Pandas DataFrame?
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edited Apr 27 at 21:17
AMC
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answer...
Why does dividing two int not yield the right value when assigned to double?
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answered Sep 27 '11 at 15:05
Chad La GuardiaChad La Guardia
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Change default app.config at runtime
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answered May 27 '11 at 11:34
Daniel HilgarthDaniel Hilgarth
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jQuery - selecting elements from inside a element
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answered Apr 27 '11 at 18:50
Jishnu A PJishnu A P
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JSF vs Facelets vs JSP [duplicate]
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edited Jan 27 '11 at 11:46
answered Jan 27 '11 at 11:39
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connecting to MySQL from the command line
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answered Feb 27 '11 at 7:12
NishantNishant
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How does '20 seconds' work in Scala?
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answered Feb 27 '13 at 5:22
Aaron NovstrupAaron Novstrup
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