isCyclic(Digraph) -- determines whether a digraph is cyclic

• Function: isCyclic

• Usage:

  C = isCyclic D

• Inputs:
  • D, a digraph,
• Outputs:
  • C, a Boolean value, Whether the digraph D is cyclic

i1 : D = digraph ({{0,1},{0,2},{2,3},{3,4},{4,2}},EntryMode=>"edges")

o1 = Digraph{0 => {1, 2}}
             1 => {}
             2 => {3}
             3 => {4}
             4 => {2}

o1 : Digraph

i2 : isCyclic D

o2 = true