data.table row-wise sum, mean, min, max like dplyr?

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  1. Extract row corresponding to minimum value of a variable by group
  2. How to create a lag variable within each group?
  3. data.table vs dplyr: can one do something well the other can’t or does poorly?
  4. Is there a dplyr equivalent to data.table::rleid?
  5. Getting the top values by group
  6. dplyr mutate/replace several columns on a subset of rows
  7. Finding Overlaps between interval sets / Efficient Overlap Joins
  8. dplyr on data.table, am I really using data.table?
  9. Merge rows in a dataframe where the rows are disjoint and contain NAs
  10. Efficient row-wise operations on a data.table
  11. How to speed up subset by groups
  12. Canonical tidyverse method to update some values of a vector from a look-up table
  13. grouped operations that result in length not equal to 1 or length of group in dplyr
  14. How to use data.table within functions and loops?
  15. Gather multiple sets of columns
  16. Select / assign to data.table when variable names are stored in a character vector
  17. How to replace NA values in a table for selected columns
  18. data.table “key indices” or “group counter”
  19. Programming with dplyr using string as input
  20. Select subset of columns in data.table R [duplicate]
  21. Count number of rows by group using dplyr
  22. How to extract the first n rows per group?
  23. Dynamically build call for lookup multiple columns
  24. Select values from different columns based on a variable containing column names [duplicate]
  25. Categorize numeric variable with mutate
  26. How to use map from purrr with dplyr::mutate to create multiple new columns based on column pairs
  27. Conditional cumsum with reset
  28. Use rle to group by runs when using dplyr
  29. Changing factor levels with dplyr mutate
  30. DT[!(x == .)] and DT[x != .] treat NA in x inconsistently

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