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From "Stephen Colebourne (JIRA)" <>
Subject [jira] [Commented] (LANG-684) Levenshtein Distance Within a Given Threshold
Date Wed, 25 May 2011 15:55:47 GMT


Stephen Colebourne commented on LANG-684:

Well, we should either move all Levenshtein distance to [codec] or add this. I've never used
LD, but constraining the time itoperates in seems like a Good Idea to me.

> Levenshtein Distance Within a Given Threshold
> ---------------------------------------------
>                 Key: LANG-684
>                 URL:
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Eli Lindsey
>            Priority: Minor
>             Fix For: 3.x
>         Attachments: LevenshteinDistanceWithThreshold.patch
> It'd be nice to have a function that calculates the Levenshtein distance only if it's
within some integer threshold.  
> Oftentimes you care less about the actual LD and more about it being within a certain
range.  This common, limited computation can be performed much faster than the normal unbounded
LD method; instead of O(nm), you can do it in O(km) (n and m are string lengths, k is the
> Also, providing a function like this makes it easier for library users to rewrite the
unbounded Levenshtein function to run in O(dm) time (d is the edit distance) if necessary.
> I'm attaching a patch that implements this function and adds appropriate test cases.

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