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Assign multiple columns using := in data.table, by group
...# 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) * 3), by = a][] # same
# a b ...
Currency formatting in Python
I am looking to format a number like 188518982.18 to £188,518,982.18 using Python.
14 Answers
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edited Sep 18 '14 at 6:29
Antony Hatchkins
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answered Dec 18 '10 at 23:43
alexalex
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edited Sep 6 '15 at 13:18
answered Jul 18 '10 at 21:56
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edited May 31 '18 at 9:17
Alberto Solano
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answered Apr 15 '11 at 12:18
blindmeisblindmeis
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When to use SELECT … FOR UPDATE?
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edited May 18 '13 at 7:15
Gili
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How to create custom exceptions in Java? [closed]
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edited Sep 10 '16 at 18:04
Solomon Ucko
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Ruby on Rails: how do I sort with two columns using ActiveRecord?
...`order` asc")
– grant
May 25 '16 at 18:36
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