As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. >>

constructs a list of unordered pairs representing the edges of graph . Each edge, directed or undirected, results in a pair in which the smaller vertex appears first.


  • ToUnorderedPairs functionality is now available in the built-in Wolfram Language function EdgeList.
  • To use , you first need to load the Combinatorica Package using Needs["Combinatorica`"].
  • An option called that takes on values All or can be used, with All being the default value. ignores multiple edges and self-loops in .
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