parents(MixedGraph,Thing) -- return the parents of a vertex of a mixed graph

Synopsis

• Function: parents

• Usage:

  parents (G,v)

• Inputs:
  • G, an instance of the type MixedGraph
  • v, a thing, a vertex of G
• Outputs:
  • a set,

Description

i1 : G = mixedGraph(graph{{3,1}},digraph {{1,2},{2,3}},bigraph {{3,4},{2,4}})

o1 = MixedGraph{Bigraph => Bigraph{2 => {4}   }}
                                   3 => {4}
                                   4 => {3, 2}
                Digraph => Digraph{1 => {2}}
                                   2 => {3}
                                   3 => {}
                Graph => Graph{1 => {3}}
                               3 => {1}

o1 : MixedGraph

i2 : parents (G,1)

o2 = set {}

o2 : Set

i3 : parents (G,2)

o3 = set {1}

o3 : Set

i4 : parents (G,3)

o4 = set {2}

o4 : Set

See also

• MixedGraph -- a graph that has undirected, directed and bidirected edges
• parents -- returns the parents of a vertex on a digraph
• children -- returns the children of a vertex of a digraph
• children(MixedGraph,Thing) -- return the children of a vertex of a mixed graph