63.22 DirectedEdges

DirectedEdges( gamma )

This function returns the set of directed (ordered) edges of the graph gamma.

See also UndirectedEdges.

    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 ] ] 

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