Dynamic Compressed Hyperoctrees with Application to the N-body Problem
Srinivas Aluru6
and Fatih E. Sevilgen7 
| (6) |
Iowa State University, Ames, IA 50011, USA |
| (7) |
Syracuse University, Syracuse, NY 13244, USA |
Abstract
Hyperoctree is a popular data structure for organizing multidimensional point data. The main drawback ofthi s data structure
is that its size and the run-time of operations supported by it are dependent upon the distribution of the points. Clarkson
rectified the distributiondependency in the size of hyperoctrees by introducing compressed hyperoctrees. He presents an O(n log n) expected time randomized algorithm to construct a compressed hyperoctree. In this paper, we give three deterministic algorithms
to construct a compressed hyperoctree in O(n log n) time, for any fixed dimension d. We present O(log n) algorithms for point and cubic region searches, point insertions and deletions. We propose a solution to the N-body problem
in O(n) time, given the tree. Our algorithms also reduce the run-time dependency on the number ofdi mensions.
This research is supported in part by ARO under DAAG55-97-1-0368, NSF CAREER under CCR-9702991 and Sandia National Laboratories.
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