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Aggregating duplicate rows by taking sum

https://www.generacodice.com/fr/articolo/13092277/aggregating-duplicate-rows-by-taking-sum
  r  -  plyr  -  data.table
StackOverflow StackOverflow

Recombining artificially split sessions in sales data based on multiple conditions

https://www.generacodice.com/fr/articolo/13073047/recombining-artificially-split-sessions-in-sales-data-based-on-multiple-conditions
  r  -  data.table
StackOverflow StackOverflow

Using roll=TRUE with allow.cartesian=TRUE

https://www.generacodice.com/fr/articolo/13067860/using-roll-true-with-allow-cartesian-true
  join  -  r  -  cartesian-product  -  data.table
StackOverflow StackOverflow

Number of Unique Rows in Subgroup

https://www.generacodice.com/fr/articolo/13059538/number-of-unique-rows-in-subgroup
  r  -  data.table
StackOverflow StackOverflow

Find rows with duplicate values across a small set of columns in R

https://www.generacodice.com/fr/articolo/13052806/find-rows-with-duplicate-values-across-a-small-set-of-columns-in-r
  r  -  data.table
StackOverflow StackOverflow

R: Checking if a set of variables forms a unique index

https://www.generacodice.com/fr/articolo/13044508/r-checking-if-a-set-of-variables-forms-a-unique-index
  r  -  data.table
StackOverflow StackOverflow

Fastest way to extract hour from time (HH:MM)

https://www.generacodice.com/fr/articolo/13020436/fastest-way-to-extract-hour-from-time-hh-mm
  time  -  r  -  hour  -  data.table
StackOverflow StackOverflow

Calculation on subset of data without first saving subset as new data.frame

https://www.generacodice.com/fr/articolo/13018051/calculation-on-subset-of-data-without-first-saving-subset-as-new-data-frame
  r  -  dataframe  -  subset  -  plyr  -  data.table
StackOverflow StackOverflow

Is a copy made when function returns a data.table?

https://www.generacodice.com/fr/articolo/13011919/is-a-copy-made-when-function-returns-a-data-table
  r  -  data.table
StackOverflow StackOverflow

Conditionally remove duplicate elements from a data.table

https://www.generacodice.com/fr/articolo/13005559/conditionally-remove-duplicate-elements-from-a-data-table
  merge  -  duplicates  -  r  -  conditional-statements  -  data.table
StackOverflow StackOverflow
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