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degreeIn -- returns the "in-degree" of a vertex in a digraph



In a directed graph, we define the degree into a vertex or the "in-degree" of a vertex to be the number of parents of that vertex. Intuitively, this give the number of edges that point into the vertex.

i1 : D = digraph({1,2,3,4},{{1,2},{2,3},{3,4},{4,2}});
i2 : degreeIn(D, 2)

o2 = 2

See also

Ways to use degreeIn :

For the programmer

The object degreeIn is a method function.