Problem 2309. Calculate the Damerau-Levenshtein distance between two strings.

Created by Jan Orwat

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<a href = "http://www.mathworks.co.uk/matlabcentral/cody/problems/2303-compute-hamming-distances-between-each-pair-of-rows-from-two-input-matrices">Problem 2303</a> reminded me a few older ones dealing with metrics between strings, problems <a href = "http://www.mathworks.co.uk/matlabcentral/cody/problems/93-calculate-the-levenshtein-distance-between-two-strings">93</a>, <a href = "http://www.mathworks.co.uk/matlabcentral/cody/problems/846-calculate-the-hamming-distance-between-two-strings">846</a> or <a href = "http://www.mathworks.co.uk/matlabcentral/cody/problems/848-calculate-a-modified-levenshtein-distance-between-two-strings">848</a>
 about Hamming and Levenshtein distances.<a href = "http://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance">Damerau-Levenshtein distance</a> is an extension to Levenshtein distance. It is also defined as minimum number of simple edit operations on string to change it into another, but the list of allowed operations is extended.As it is written on Wikipedia there are 4 allowed edits: deletion, insertion and substitution of an single character and an transposition of two adjacent characters.Example. Such defined distance between words gifts and profit is 5:<pre class="language-matlab">gifts =&gt; pgifts (insertion of 'p')
pgifts =&gt; prgifts (insertion of 'r')
prgifts =&gt; proifts (substitution of 'g' to 'o')
proifts =&gt; profits (transposition of 'if' to 'fi')
profits =&gt; profit (deletion of 's')
</pre>

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Last Solution submitted on Jan 10, 2021

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3 Comments

Asif Newaz on 25 Jan 2020

i am facing a problem with ur test suite 5. is it correct?
even the built-in matlab function 'edit distance' is giving the result 3.
which i believe is the correct one.
if i am not wrong, according to demarau algorithm - here transposition will not occur.

Rafael S.T. Vieira on 3 Sep 2020

Test case #5 is correct, Asif. If you want, you can try it on wolfram alpha using DamerauLevenshteinDistance['abc','ca']. Be careful, because the algorithm from wikipedia has errors.

Rafael S.T. Vieira on 3 Sep 2020

Another example that should return 2 via Damerou-Levenshtein and 3 via Levenshtein alone: 'jellyfish' and 'jellyifhs'.

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Problem 2309. Calculate the Damerau-Levenshtein distance between two strings.

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Problem 2309. Calculate the Damerau-Levenshtein distance between two strings.

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