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Logic to test that 3 of 4 are True
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edited Mar 20 '14 at 12:08
Renjith Krishnan
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What is the optimal Jewish toenail cutting algorithm?
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BoltClock♦
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answered Oct 14 '11 at 14:43
KevinKevi...
How do I make a matrix from a list of vectors in R?
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– andrewj
Aug 28 '09 at 14:23
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Assign multiple columns using := in data.table, by group
...# 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
x[ , get("mynames") := list(mean(b) * ...
jQuery select by attribute using AND and OR operators
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edited May 21 '12 at 14:34
answered May 21 '12 at 14:27
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how to change default python version?
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14 Answers
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Error installing libv8: ERROR: Failed to build gem native extension
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614
try this one:
gem install libv8 -v '3.16.14.3' -- --with-system-v8
Note : Because libv8 ...
Replacement for “rename” in dplyr
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148
dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <-...
filter items in a python dictionary where keys contain a specific string
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answered May 26 '14 at 3:49
Jonathon ReinhartJonathon Reinhart
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Cannot ping AWS EC2 instance
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edited Nov 1 '17 at 14:18
Undo♦
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