Select or remove study variables

Usage

select_variables(data, keep = NULL, drop = NULL)

Arguments

data: Base data.frame, or a simulab_sim.
keep: Variables to retain, in the order given. A character vector of column names, or NULL (the default).
drop: Variables to remove, the others keeping their order. A character vector of column names, or NULL (the default). Only one of keep and drop may be given.

Value

A simulab_sim base data.frame with every row of data and the requested variables.

Examples

data <- data.frame(id = 1:5, keep_me = 1:5, drop_me = 6:10)
select_variables(data, keep = c("id", "keep_me"))
#> <simulab_sim:selected_variables> 5 rows x 2 columns
#>   id keep_me
#> 1  1       1
#> 2  2       2
#> 3  3       3
#> 4  4       4
#> 5  5       5
select_variables(data, drop = "drop_me")
#> <simulab_sim:selected_variables> 5 rows x 2 columns
#>   id keep_me
#> 1  1       1
#> 2  2       2
#> 3  3       3
#> 4  4       4
#> 5  5       5