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Add id

Source: R/misc.R
add_id.Rd

Function to add 'id' to a data.frame if it is not already there.

Usage

add_id(df)

Arguments

df

A data.frame.

Value

A data.frame that includes a column called 'id' of type 'character' which contains a unique identifiers for all rows in the data.frame.

Details

Searches the data.frame for variables that include 'id' in their name. Checks if any of these is a unique identifier. If so, this variable is renamed 'word_id' and forced into type 'character'. If not, a new column named 'word_id' of type 'character' is created, containing a string of numbers that uniquely identify all rows in the data.frame.

See also

find_unique_id, add_multiwords

Examples

t1 <- data.frame(id = 1:10, a = sample(letters, 10))
t2 <- data.frame(id = rep(1, 10),
                word_id = sprintf("%02d", 1:10),
                a = sample(letters, 10))
t3 <- data.frame(a = sample(letters, 10))
add_id(t1)
#>    id a
#> 1   1 t
#> 2   2 g
#> 3   3 j
#> 4   4 o
#> 5   5 b
#> 6   6 h
#> 7   7 w
#> 8   8 k
#> 9   9 m
#> 10 10 y
add_id(t2)
#>    id a
#> 1  01 v
#> 2  02 y
#> 3  03 m
#> 4  04 e
#> 5  05 a
#> 6  06 x
#> 7  07 u
#> 8  08 p
#> 9  09 w
#> 10 10 k
add_id(t3)
#>    a id
#> 1  q 01
#> 2  k 02
#> 3  h 03
#> 4  d 04
#> 5  p 05
#> 6  e 06
#> 7  l 07
#> 8  g 08
#> 9  m 09
#> 10 v 10