Combine hierarchical classifications — combine

Combine hierarchical classifications by stacking one classification after another.

Usage

combine_classifications(..., sep = ".")

Arguments

...: A collection of lists, one for each classification, each giving the "digits" that represent each level in the hierarchy, as made by expand_classification() or split_classification().
sep: A character used to separate the classifications in .... The default separates levels across classifications by ".".

Value

A list with a entry for each level in the combined classification.

Examples

# Combine an unbalanced industry classification with a balanced
# geographic classification

industry <- c("111", "112", "12")
region <- c("11", "21", "22")

combine_classifications(
  expand_classification(industry, pad = "0"),
  expand_classification(region)
)
#> [[1]]
#> [1] "1" "1" "1"
#> 
#> [[2]]
#> [1] "11" "11" "12"
#> 
#> [[3]]
#> [1] "111" "112" "120"
#> 
#> [[4]]
#> [1] "111.1" "112.2" "120.2"
#> 
#> [[5]]
#> [1] "111.11" "112.21" "120.22"
#>