### Abstract

In 2001, Duchon, Flajolet, Louchard and Schaeffer introduced Boltzmann samplers, a radically novel way to efficiently generate huge random combinatorial objects without any preprocessing; the insight was that the probabilities can be obtained directly by evaluating the generating functions of combinatorials classes. Over the following decade, a vast array of papers has increased the formal expressiveness of these random samplers. Our paper introduces a new kind of sampler which generates multiplicative combinatorial structures, which enumerated by Dirichlet generating functions. Such classes, which are significantly harder to analyze than their additive counterparts, are at the intersection of combinatorics and analytic number theory. Indeed, one example we fully discuss is that of ordered factorizations. While we recycle many of the concepts of Boltzmann random sampling, our samplers no longer obey a Boltzmann distribution; we thus have coined a new name for them: Dirichlet samplers. These are very efficient as they can generate objects of size n in O((log n)^{2}) worst-case time complexity. By providing a means by which to generate very large random multiplicative objects, our Dirichlet samplers can facilitate the investigation of these interesting, yet little studied structures. We also hope to illustrate some of our general ideas regarding the future direction for random sampling.

Original language | English (US) |
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Title of host publication | 9th Meeting on Analytic Algorithmics and Combinatorics 2012, ANALCO 2012 |

Publisher | Society for Industrial and Applied Mathematics Publications |

Pages | 83-97 |

Number of pages | 15 |

ISBN (Electronic) | 9781618396235 |

State | Published - Jan 1 2012 |

Externally published | Yes |

Event | 9th Meeting on Analytic Algorithmics and Combinatorics, ANALCO 2012 - Kyoto, Japan Duration: Jan 16 2012 → … |

### Publication series

Name | 9th Meeting on Analytic Algorithmics and Combinatorics 2012, ANALCO 2012 |
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### Conference

Conference | 9th Meeting on Analytic Algorithmics and Combinatorics, ANALCO 2012 |
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Country | Japan |

City | Kyoto |

Period | 1/16/12 → … |

### All Science Journal Classification (ASJC) codes

- Applied Mathematics
- Materials Chemistry
- Discrete Mathematics and Combinatorics

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## Cite this

*9th Meeting on Analytic Algorithmics and Combinatorics 2012, ANALCO 2012*(pp. 83-97). (9th Meeting on Analytic Algorithmics and Combinatorics 2012, ANALCO 2012). Society for Industrial and Applied Mathematics Publications.