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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...
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Difference between subprocess.Popen and os.system

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Template function inside template class

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How can I map True/False to 1/0 in a Pandas DataFrame?

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Why does dividing two int not yield the right value when assigned to double?

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Change default app.config at runtime

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jQuery - selecting elements from inside a element

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JSF vs Facelets vs JSP [duplicate]

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connecting to MySQL from the command line

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How does '20 seconds' work in Scala?

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