Text 0.4.0 porterstemmer stem

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PorterStemmer.Stem

The Porter stem of one English word.

public static string Stem(string word)

Parameters — word is a single word, not a sentence. It is lowercased before the first step runs.

Returns — string, the stem, always lowercase.

Exceptions — ArgumentNullException when word is null. An empty string is returned unchanged, as is any word of two characters or fewer.

Example — the same word under both English stemmers, which is the only reason to prefer this one.

using Lodestar.Text.Stemming;

string original = PorterStemmer.Stem("ties");  // => ti
string revised = EnglishSnowballStemmer.Stem("ties");  // => tie

Remarks — ti is not a mistake in this implementation; it is what the 1980 algorithm specifies, and nltk returns it too. Preserving that is the point of shipping the original at all. If the answer looks wrong, the fix is EnglishSnowballStemmer.Stem, not a patch here.

Only ASCII letters are treated as letters. Accented input is neither rejected nor folded — it is simply not what the rules were written for, and another language's stemmer is the right answer for another language's text.

Applies to — net10.0, netstandard2.0.

See also — PorterStemmer, EnglishSnowballStemmer.Stem, the stemming index.