Using data.table i and j arguments in functions

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  12. Fill in missing values by group in data.table
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  16. Sort a data.table fast by Ascending/Descending order
  17. Join R data.tables where key values are not exactly equal–combine rows with closest times
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  25. How to select R data.table rows based on substring match (a la SQL like)
  26. Any way to force fread() of data.table not to stop on empty lines?
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