Working on vectors - Githubissues

ugexe / Raku-Text--Levenshtein--Damerau

Damerau Levenshtein edit distance in Raku

Artistic License 2.0

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Working on vectors #13

Open antononcube opened 5 months ago

antononcube commented 5 months ago

Please make dld (and related functions) work on vectors (Positionals).

This works:

dld('Pepa' 'Pepper')

# 3

This does not, but it would be nice if it did:

dld('Pepa'.comb, 'Pepper'.comb)

# This type cannot unbox to a native string: P6opaque, Seq

Motivation

Using dld as a distance function in nearest neighbor finding algorithms.
- Like those in "Math::Nearest".
Having common behavior with other distance functions.
- Like hamming-distance in "Math::DistanceFunctions".

ugexe commented 5 months ago

For the most part I'd be ok with accepting a PR that adds a new multi to accommodate this.

I am not immediately sure how to handle cases where an element in the list contains multiple letters though, i.e. dld(['AA','b','c'], ['A','c','b']). It would be simple enough to add a check that each item in the list is only a single character, but I'm not sure if the performance penalty would be acceptable. What do you think?

antononcube commented 5 months ago

In dld(['AA','b','c'], ['A','c','b']) the strings should be treated as characters. I.e. how many edits it will take to turn the first vector into the second.

I consider submitting a PR -- should have tests for dld over vectors.