Get root taxa — roots • taxa

Get the indexes of root taxa in a taxonomy.

Usage

roots(x, subset = NULL)

Arguments

x: An object containing taxonomic relationships, such as taxonomy objects.
subset: The subset of the tree to search for roots to that subset. Can be indexes or names.

See also

Other taxonomy functions: internodes(), leaves(), stems(), subtaxa(), supertaxa()

Other root functions: is_root()

Examples

x <- taxonomy(c('Carnivora', 'Felidae', 'Panthera', 'Panthera leo',
                'Panthera tigris', 'Ursidae', 'Ursus', 'Ursus arctos'),
              supertaxa = c(NA, 1, 2, 3, 3, 1, 6, 7))
roots(x)
#> [1] 1
roots(x, subset = 2:8)
#> [1] 2 6