Test if taxa are roots

Check if each taxon is a root. A root is a taxon with no supertaxon.

Usage

is_root(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 root functions: roots()

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))
is_root(x)
#> [1]  TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
is_root(x, subset = 2:8)
#> [1] FALSE  TRUE FALSE FALSE FALSE  TRUE FALSE FALSE