find a subset of the tree

Usage

# S4 method for class 'atctree'
x[i, j = 1L]

Arguments

x: object of class atctree
i: label (ATC code) of focal node
j: generation (integer). 0: siblings, -1: children, -2: grandchildren, 1: parents etc

Value

an object of class atctree

Details

The subset method for objects of class atctree uses a focal node and a specification of how many generations to accrue. The focal node is specified by an ATC code at any of the five levels (e.g. i="A01"). The generation is specified by integer j, signed positive for ancestors and negative for descendants.

Examples

h <- atctree(schema="full")
#more useful to use the full tree with this approach
# plot descendents of P01 (as far as grandchildren):
h["P01",-2] |> plot(stem_label=TRUE, leaf_label=TRUE)
#> Remember you can hover over nodes to see text

# plot descendents of P01 (as far as great grandchildren):
h["P01",-3] |> plot(stem_label=TRUE, leaf_label=FALSE)
#> Remember you can hover over nodes to see text

# plot descendents of parent of P01A:
h["P01A",1] |> plot(stem_label=TRUE, leaf_label=TRUE)
#> Remember you can hover over nodes to see text

# plot descendents of grandparent of P01A:
h["P01A",2] |> plot(stem_label=TRUE, leaf_label=TRUE)
#> Remember you can hover over nodes to see text