63.23 UndirectedEdges

UndirectedEdges( gamma )

This function returns the set of undirected (unordered) edges of gamma, which must be a simple graph.

See also DirectedEdges.

    gap> gamma := JohnsonGraph( 3, 2 );
    rec(
      isGraph := true,
      order := 3,
      group := Group( (1,3), (1,2) ),
      schreierVector := [ -1, 2, 1 ],
      adjacencies := [ [ 2, 3 ] ],
      representatives := [ 1 ],
      names := [ [ 1, 2 ], [ 1, 3 ], [ 2, 3 ] ],
      isSimple := true )
    gap> DirectedEdges( gamma );
    [ [ 1, 2 ], [ 1, 3 ], [ 2, 1 ], [ 2, 3 ], [ 3, 1 ], [ 3, 2 ] ]
    gap> UndirectedEdges( gamma );
    [ [ 1, 2 ], [ 1, 3 ], [ 2, 3 ] ] 

Previous Up Top Next
Index