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Grouping functions (tapply, by, aggregate) and the *apply family
r
r-faq
lapply
sapply
tapply
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Firebase query if child of child contains a value
javascript
angular
firebase
firebase-realtime-database
angularfire2
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How do I match any character across multiple lines in a regular expression?
regex
multiline
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Why does printf not flush after the call unless a newline is in the format string?
c#
printf
flush
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Dynamically select data frame columns using $ and a character value
r
r-faq
dataframe
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