getRepeatedRowsByKeys: Get repeated rows by key
In AlejandroKantor/akmisc: Miscellaneous Functions for Data Manipulation

Description Usage Arguments Details Value Examples

Returns a data.table of the repeated rows for a given key.

1	getRepeatedRowsByKeys(dt_data, v_s_keys = NULL)

`dt_data`	a data.table.
`v_s_keys`	a character vector of column names in `dt_data`.

all rows of dt_data for which the combination of values of v_s_keys are repeated is returned. Additionally a new column rep_count_ is added which indicates the number of times the key combination is repeated in the data set. If there is no repeated cases function returns NULL.

a data.table of all the rows which the combination of the values of v_s_keys are repeated. See details.

library(data.table)
dt_data <- data.table( unique_identifier = c(1,2,3,3,3,4,4,5), value = rnorm(8))

getRepeatedRowsByKeys(dt_data, "unique_identifier")