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A random polynomial-time algorithm for approximating the volume of convex bodies

Published: 03 January 1991 Publication History

Abstract

A randomized polynomial-time algorithm for approximating the volume of a convex body K in n-dimensional Euclidean space is presented. The proof of correctness of the algorithm relies on recent theory of rapidly mixing Markov chains and isoperimetric inequalities to show that a certain random walk can be used to sample nearly uniformly from within K.

References

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~BARANY, I., AND FUREDI, Z. Computing the volume is difficult. In Proceed~t~gs of the 18th Annual ~AC,5! S l't>lposlum on Theory of Compttllng (Berkeley, Calif., May 28-30). ACM, New York, 1986, ~ pp. 442-447.
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Patrick J. Ryan

The authors present an algorithm for approximating the volume of a compact convex set <__?__Pub Fmt italic>K<__?__Pub Fmt /italic> in R n . The problem is difficult. The time required for the algorithm is shown to be polynomial in the dimension <__?__Pub Fmt italic>n<__?__Pub Fmt /italic>, but success (within a prescribed tolerance) is guaranteed only with probability 3/4. Since analysis of the algorithm is quite technical, I present only a brief sketch <__?__Pub Caret> here. After suitable normalization, the set <__?__Pub Fmt italic>K<__?__Pub Fmt /italic> may be taken to contain the unit ball <__?__Pub Fmt italic>B<__?__Pub Fmt /italic> but lie within the concentric ball <__?__Pub Fmt italic>rB<__?__Pub Fmt /italic>, where r= n+1 n . A shell-like decomposition K=K k ?K k-1 ?&ldots;?K 1 ?K 0 =rB is used to express the volume of <__?__Pub Fmt italic>K<__?__Pub Fmt /italic> as a telescoping product of the ratios of volumes of successive members K i ,K i-1 of the sequence. The space is covered by a fixed grid of cubes, and each ratio is computed by a specified number of trials; each trial involves choosing a point at random from a randomly chosen cube, then checking membership in K i-1 and K i . For each trial, the cube chosen is the result of a random walk of a fixed length polynomial in <__?__Pub Fmt italic>n<__?__Pub Fmt /italic>. The authors use the ergodic property of Markov chains to argue that this method gives a nearly uniform distribution from which the cubes are sampled. The paper contains many illuminating remarks in addition to the technical description and analysis of the algorithm.

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Published In

cover image Journal of the ACM
Journal of the ACM  Volume 38, Issue 1
Jan. 1991
254 pages
ISSN:0004-5411
EISSN:1557-735X
DOI:10.1145/102782
Issue’s Table of Contents
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

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Publication History

Published: 03 January 1991
Published in JACM Volume 38, Issue 1

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Author Tags

  1. convex sets
  2. random walks
  3. sampling
  4. volume

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