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parents -- returns the parents of a vertex on a digraph



The parents of a vertex v in a digraph D are all the vertexSet u in D such that {u,v} is an edge of D. In other words, the parents of v are all the vertexSet that have edges coming out of them that point at v.

i1 : D = digraph({a,b,c,d,e},{{a,b},{b,c},{b,d},{e,b}});
i2 : parents (D, b)

o2 = set {a, e}

o2 : Set

See also

Ways to use parents :

For the programmer

The object parents is a method function.