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Grouping functions (tapply, by, aggregate) and the *apply family

rr-faqlapplysapplytapply
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Firebase query if child of child contains a value

javascriptangularfirebasefirebase-realtime-databaseangularfire2
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How do I match any character across multiple lines in a regular expression?

regexmultiline
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Why does printf not flush after the call unless a newline is in the format string?

c#printfflush
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Dynamically select data frame columns using $ and a character value

rr-faqdataframe
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