exogenous: Get all exogenous nodes in a 'caugi'

In caugi: Causal Graph Interface

Get all exogenous nodes in a caugi

Description

Get all exogenous nodes (nodes with no parents) in a caugi.

Usage

exogenous(cg, undirected_as_parents = FALSE)

Arguments

cg	A caugi object.
undirected_as_parents	Logical; if TRUE, undirected edges are treated as (possible) parents, if FALSE (default), undirected edges are ignored.

Value

Either a character vector of node names (if a single node is requested) or a list of character vectors (if multiple nodes are requested).

See Also

Other queries: ancestors(), anteriors(), children(), components(), descendants(), districts(), edge_types(), edges(), is_acyclic(), is_admg(), is_ag(), is_caugi(), is_cpdag(), is_dag(), is_empty_caugi(), is_mag(), is_mpdag(), is_pdag(), is_simple(), is_ug(), m_separated(), markov_blanket(), neighbors(), nodes(), parents(), posteriors(), same_nodes(), spouses(), subgraph(), topological_sort()

Examples

cg <- caugi(
  A %-->% B,
  B %-->% C,
  class = "DAG"
)
exogenous(cg) # "A"

caugi documentation built on Oct. 28, 2026, 1:07 a.m.