add missing rows to a data table

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  3. Why does X[Y] join of data.tables not allow a full outer join, or a left join?
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  13. How to reorder data.table columns (without copying)
  14. Using setDT inside a function
  15. how to show a legend on dual y-axis ggplot
  16. How to add a index by set of data when using rbindlist?
  17. Dynamically add column names to data.table when aggregating
  18. R: Reshaping Multiple Columns from Long to Wide
  19. Why is as.Date slow on a character vector?
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  21. Apply a function to a subset of data.table columns, by column-indices instead of name
  22. R data.table apply function to rows using columns as arguments
  23. R: how to rbind two huge data-frames without running out of memory
  24. Using data.table i and j arguments in functions
  25. R data.table breaks in exported functions
  26. Applying a function to each row of a data.table
  27. Empty factors in “by” data.table
  28. How to use data.table within functions and loops?
  29. What you can do with a data.frame that you can’t with a data.table?
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