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# havel_hakimi_graph

havel_hakimi_graph(deg_sequence, create_using=None)

  Returns a simple graph with given degree sequence constructed using the Havel-Hakimi algorithm.

  Parameters:
    deg_sequence: list of integers

      Each integer corresponds to the degree of a node (need not be sorted).

    create_using NetworkX graph constructor, optional (default=nx.Graph)

      Graph type to create. If graph instance, then cleared before populated. Directed graphs are not allowed.

  Raises:
    NetworkXException

      For a non-graphical degree sequence (i.e. one not realizable by some simple graph).

  Notes

  The Havel-Hakimi algorithm constructs a simple graph by successively connecting the node of highest degree to other nodes of highest degree, resorting remaining nodes by degree, and repeating the process. The resulting graph has a high degree-associativity. Nodes are labeled 1,.., len(deg_sequence), corresponding to their position in deg_sequence.

  The basic algorithm is from Hakimi [1] and was generalized by Kleitman and Wang [2].

  References

  [1]

  Hakimi S., On Realizability of a Set of Integers as Degrees of the Vertices of a Linear Graph. I, Journal of SIAM, 10(3), pp. 496-506 (1962)

  [2]

  Kleitman D.J. and Wang D.L. Algorithms for Constructing Graphs and Digraphs with Given Valences and Factors Discrete Mathematics, 6(1), pp. 79-88 (1973)