dt.combination: Combines 2 columns from a datatable into a 1 column...
In YoannPa/DTrsiv: R data.table functions to easily clean data

dt.combination

R Documentation

Combines 2 columns from a datatable into a 1 column data.table.

Combines 2 columns from a datatable into a 1 column data.table.

dt.combination(DT, cols, mrg.col, keep.colname = NULL, check.len = TRUE)

`DT`	A `data.table`.
`cols`	A `character` vector of length 2 matching columns names of DT.
`mrg.col`	A `character` to be used to name the resulting combined column.
`keep.colname`	An `integer` equals to 1, or 2, or NULL. If equals to 1, the resulting combined column will be named after the first column in 'cols'. If equals to 2, the resulting combined column will be named after the second column in 'cols'. If NULL, keep.colname is not used for the naming of the resulting combined column (Default: keep.colname = NULL).
`check.len`	A `logical` specifying whether the length of each values obtained in the resulting combined column should be checked (Default : check.len = TRUE) or not (check.len = FALSE). If check.len = TRUE and the length of any value is superior to 1, an error message will be returned. It can be useful sometimes to set check.len to FALSE, especially if you know that some values in the columns you want to combine contain whitespaces. In such case, it is advised to set check.len = TRUE.