Extract several single elements from a string.

Source: R/elem.R

Efficiently extract several elements from a string. See str_elem() for extracting single elements. This function is vectorized over the first argument.

str_elems(string, indices, byrow = TRUE)

Arguments

string

A character vector.

indices

A vector of integerish values. Negative indexing is allowed as in stringr::str_sub().

byrow

Should the elements be organised in the matrix with one row per string (byrow = TRUE, the default) or one column per string (byrow = FALSE). See examples if you don't understand.

Value

A character matrix.

See also

Other single element extractors: str_elem(), str_paste_elems()

Examples

string <- c("abc", "def", "ghi", "vwxyz")
str_elems(string, 1:2)
#>      [,1] [,2]
#> [1,] "a"  "b" 
#> [2,] "d"  "e" 
#> [3,] "g"  "h" 
#> [4,] "v"  "w" 
str_elems(string, 1:2, byrow = FALSE)
#>      [,1] [,2] [,3] [,4]
#> [1,] "a"  "d"  "g"  "v" 
#> [2,] "b"  "e"  "h"  "w" 
str_elems(string, c(1, 2, 3, 4, -1))
#>      [,1] [,2] [,3] [,4] [,5]
#> [1,] "a"  "b"  "c"  ""   "c" 
#> [2,] "d"  "e"  "f"  ""   "f" 
#> [3,] "g"  "h"  "i"  ""   "i" 
#> [4,] "v"  "w"  "x"  "y"  "z"