# Changeset 770:432c54cec63c in lemon-main for doc

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Timestamp:
11/05/09 08:39:49 (11 years ago)
Branch:
default
Parents:
769:e746fb14e680 (diff), 757:9fbbd802020f (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
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Phase:
public
Message:

Merge #179 (Port the min mean cycle algorithms)

Files:
2 edited

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 r755 /** @defgroup min_mean_cycle Minimum Mean Cycle Algorithms @ingroup algs \brief Algorithms for finding minimum mean cycles. This group contains the algorithms for finding minimum mean cycles. The \e minimum \e mean \e cycle \e problem is to find a directed cycle of minimum mean length (cost) in a digraph. The mean length of a cycle is the average length of its arcs, i.e. the ratio between the total length of the cycle and the number of arcs on it. This problem has an important connection to \e conservative \e length \e functions, too. A length function on the arcs of a digraph is called conservative if and only if there is no directed cycle of negative total length. For an arbitrary length function, the negative of the minimum cycle mean is the smallest \f$\epsilon\f$ value so that increasing the arc lengths uniformly by \f$\epsilon\f$ results in a conservative length function. LEMON contains three algorithms for solving the minimum mean cycle problem: - \ref Karp "Karp"'s original algorithm. - \ref HartmannOrlin "Hartmann-Orlin"'s algorithm, which is an improved version of Karp's algorithm. - \ref Howard "Howard"'s policy iteration algorithm. In practice, the Howard algorithm proved to be by far the most efficient one, though the best known theoretical bound on its running time is exponential. Both Karp and HartmannOrlin algorithms run in time O(ne) and use space O(n2+e), but the latter one is typically faster due to the applied early termination scheme. */ /** @defgroup matching Matching Algorithms @ingroup algs