Checks if a node in a graph has parents

This function validates if any edge points to the given node.

Usage

has_parents(graph, nodes)

Arguments

graph

A graph object

nodes

A character vector of nodes to determine

Value

A logical vector with the same length as nodes

Examples

graph <- graph_builder() |>
  add_edge(from = "A", to = "B") |>
  build_directed()
graph
#> # of nodes: 2
#> # of edges: 1
#> # of roots: 1
#> # of leaves: 1
#> 
#> |     Parent      |      Child      |
#> | --------------- | --------------- |
#> | A               | B               |
#> 

graph |> has_parents(nodes = "A")
#> [1] FALSE
graph |> has_parents(nodes = "B")
#> [1] TRUE