1409.sagews

D = DiGraph( { "A": ["B","C"], "B": ["C","D"], "C": ["B","D","E"], "D": ["E"], "E": ["D"]} )
D.plot()

D = DiGraph( { "A": ["B","C"], "B": ["C","D"], "C": ["B","D","E"], "D": ["E"], "E": ["D"]} )
D.plot3d(viewer="tachyon")

A = matrix([[0,10,3,0,0],[0,0,1,2,0],[0,4,0,8,2],[0,0,0,0,7],[0,0,0,9,0]])
DiGraph(A).plot()