TryGetEdge.fsx

#r "nuget: FSharp.FGL, 0.0.4"
#r "nuget: FSharp.FGL.ArrayAdjacencyGraph"

open FSharp.FGL
open FSharp.FGL.ArrayAdjacencyGraph

let vertices =
    [ for i=01 to 3 do (i,i) ]

let edges =
    [
        1,2,1.0
        2,3,1.0
    ]   

let graph = ArrayAdjacencyGraph(vertices,edges)

// returns Some 
graph.TryGetEdge (1,2) 
// returns None - in an undirected graph the order of params shouldnt matter. 
graph.TryGetEdge (2,1)