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Assign multiple columns using := in data.table, by group
... a b col1 col2 mean sum Name1 Longer%
# 1: 1 1 hi hello 2.5 5 10 15
# 2: 2 2 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
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Change a branch name in a Git repo
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answered Oct 5 '10 at 19:25
Richard FearnRichard Fearn
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How can I wait till the Parallel.ForEach completes
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Henk HoltermanHenk Holterman
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“use database_name” command in PostgreSQL
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VPK
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answered Apr 26 '12 at 17:25
kgrittnkgrittn
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What are “first class” objects?
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180
In short, it means there are no restrictions on the object's use. It's the same as
any other obj...
In Unix, can I run 'make' in a directory without cd'ing to that directory first?
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edited Jan 17 '09 at 16:14
Svante
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How do I detach objects in Entity Framework Code First?
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edited Apr 10 '15 at 16:59
saluce
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What is 'define' used for in JavaScript (aside from the obvious)?
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answered Apr 26 '12 at 10:11
James AllardiceJames Allardice
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How to delete a word and go into insert mode in Vim?
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edited Sep 7 '09 at 4:30
answered Sep 4 '09 at 13:20
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How to convert An NSInteger to an int?
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206
Ta da:
NSInteger myInteger = 42;
int myInt = (int) myInteger;
NSInteger is nothing more than...