This function creates a union of all vertices of a graph of class MixedGraph. This is an adaptation of vertices and vertexSet from Graphs.
i1 : G = mixedGraph(graph{{3,1}},digraph {{1,2},{2,3}},bigraph {{3,4}}) o1 = MixedGraph{Bigraph => Bigraph{3 => {4}}} 4 => {3} Digraph => Digraph{1 => {2}} 2 => {3} 3 => {} Graph => Graph{1 => {3}} 3 => {1} o1 : MixedGraph |
i2 : vertices G o2 = {1, 2, 3, 4} o2 : List |
i3 : vertexSet G o3 = {1, 2, 3, 4} o3 : List |