The bktrees package

[ Tags: bsd3, data-structures, library ] [ Propose Tags ]

Burkhard-Keller trees provide an implementation of sets which apart from the ordinary operations also has an approximate member search, allowing you to search for elements that are of a certain distance from the element you are searching for.


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Versions 0.1, 0.1.1, 0.1.2, 0.1.3, 0.2, 0.2.1, 0.2.2, 0.3, 0.3.1
Dependencies array, base (<5), containers [details]
License BSD3
Author Josef Svenningsson
Maintainer josef.svenningsson@gmail.com
Category Data Structures
Source repository head: darcs get http://patch-tag.com/r/josef/bktrees
Uploaded Mon Nov 22 23:23:44 UTC 2010 by JosefSvenningsson
Distributions NixOS:0.3.1
Downloads 11209 total (34 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
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Status Docs uploaded by user
Build status unknown [no reports yet]
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Readme for bktrees-0.3.1

[back to package description]
This is a module I hacked together quickly after having read the following
blog post:
http://blog.notdot.net/archives/30-Damn-Cool-Algorithms,-Part-1-BK-Trees.html

I thought the data structure sounded cool so I thought it would be an 
interesting excerise to implement it. 

BK-trees can apparently perform very good in some circumstances. The 
paper "Fast Approximate String Matching in a Dictionary" (Baeza-Yates, 
Navarro 1998) recommends them over other structures for doing 
approximate search.
http://citeseer.ist.psu.edu/1593.html

The original paper can be found here:
http://portal.acm.org/citation.cfm?id=362003.362025

Henning Günter <h.guenther@tu-bs.de> generously supplied two algorithms for
computing the levenshtein edit distance. The better one of the two is used in
the list instance for the Metric class.