### Abstract

Jim Propp's P-machine, also known as 'rotor router model' is a simple deterministic process that simulates a random walk on a graph. Instead of distributing chips to randomly chosen neighbors, it serves the neighbors in a fixed order. We investigate how well this process simulates a random walk. For the graph being the infinite path, we show that, independent of the starting configuration, at each time and on each vertex, the number of chips on this vertex deviates from the expected number of chips in the random walk model by at most a constant C_{1}, which is approximately 2.29. For intervals of length L, this improves to a difference of O(log L) (instead of 2.29L), for the L_{2} average of a contiguous set of intervals even to O(√log L). It seems plausible that similar results hold for higher-dimensional grids ℤ^{d} instead of the path ℤ.

Original language | English |
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Title of host publication | Proceedings of the 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics |

Pages | 185-197 |

Number of pages | 13 |

Publication status | Published - May 30 2006 |

Event | 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics - Miami, FL, United States Duration: Jan 21 2006 → Jan 21 2006 |

### Publication series

Name | Proceedings of the 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics |
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Volume | 2006 |

### Other

Other | 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics |
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Country | United States |

City | Miami, FL |

Period | 1/21/06 → 1/21/06 |

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### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Proceedings of the 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics*(pp. 185-197). (Proceedings of the 8th Workshop on Algorithm Engineering and Experiments and the 3rd Workshop on Analytic Algorithms and Combinatorics; Vol. 2006).