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Assign multiple columns using := in data.table, by group
... 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
x[ , get("mynames") := list(mean(b) * 4, sum(b...
How can I strip first and last double quotes?
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answered Jun 21 '10 at 14:15
houbysofthoubysoft
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SQL selecting rows by most recent date
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edited Oct 9 '08 at 21:55
Adam Pierce
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an...
Setting an int to Infinity in C++
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answered Dec 31 '11 at 21:11
Etienne de MartelEtienne de Martel
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What does the “assert” keyword do? [duplicate]
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edited Oct 29 '16 at 21:46
answered Jun 10 '10 at 21:40
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Compare DATETIME and DATE ignoring time portion
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answered Mar 3 '17 at 21:22
pimbrouwerspimbrouwers
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How to replace an entire line in a text file by line number
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edited Jun 21 '12 at 19:39
answered Jun 21 '12 at 19:26
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MySQL ON DUPLICATE KEY UPDATE for multiple rows insert in single query
...T INTO beautiful (name, age)
VALUES
('Helen', 24),
('Katrina', 21),
('Samia', 22),
('Hui Ling', 25),
('Yumie', 29)
ON DUPLICATE KEY UPDATE
age = VALUES(age),
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How do I know which version of Javascript I'm using?
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rink.attendant.6
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answered Nov 24 '10 at 21:12
Nick Craver♦Nic...
Long-held, incorrect programming assumptions [closed]
...t know. So, stay cool.
– jbasko
May 21 '09 at 5:19
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It also helps to understand that those blog...