possible_ids {joyn}

Find possible unique identifies of data frame

Description

Identify possible variables uniquely identifying x

Usage

possible_ids(
  dt,
  exclude = NULL,
  include = NULL,
  verbose = getOption("possible_ids.verbose")
)

Arguments

dt

data frame

exclude

character: Exclude variables to be selected as identifiers. It could be either the name of the variables of one type of the variable prefixed by "_". For instance, "_numeric" or "_character".

include

character: Name of variable to be included, that might belong to the group excluded in the exclude

verbose

logical: If FALSE no message will be displayed. Default is TRUE

Value

list with possible identifiers

Examples

library(data.table)
x4 = data.table(id1 = c(1, 1, 2, 3, 3),
                id2 = c(1, 1, 2, 3, 4),
                t   = c(1L, 2L, 1L, 2L, NA_integer_),
                x   = c(16, 12, NA, NA, 15))
possible_ids(x4)