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Overview
| Comment: | Update the spellfix1 documentation regarding the k1 column of the %_vocab table. |
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| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | 92cb32fb5007ee121f2704a5f2de327b |
| User & Date: | drh 2018-02-14 14:14:05 |
Context
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2018-02-14
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| 18:59 | Avoid extra / characters in the redirect to /index.html from / in althttpd.c. check-in: 4f48a846f6 user: drh tags: trunk | |
| 14:14 | Update the spellfix1 documentation regarding the k1 column of the %_vocab table. check-in: 92cb32fb50 user: drh tags: trunk | |
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2018-02-13
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| 22:16 | Fix an issue with not-found processing in althttpd.c. check-in: 72c8b8c6ff user: drh tags: trunk | |
Changes
Changes to pages/spellfix1.in.
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characters into ASCII. Examples: "æ" -> "ae", "þ" -> "th", "ß" -> "ss", "á" -> "a", ... The accessory function spellfix1_translit(X) will do the non-ASCII to ASCII mapping. The built-in lower(X) function will convert to lower-case. Thus: k1 = lower(spellfix1_translit(word)). <dt><p><b>k2</b><dd> This field holds a phonetic code derived from k1. Letters that have similar sounds are mapped into the same symbol. For example, all vowels and vowel clusters become the single symbol "A". And the letters "p", "b", "f", and "v" all become "B". All nasal sounds are represented as "N". And so forth. The mapping is base on ideas found in Soundex, Metaphone, and other long-standing phonetic matching systems. This key can be generated by the function spellfix1_phonehash(X). Hence: k2 = spellfix1_phonehash(k1) </dl> <p>There is also a function for computing the Wagner edit distance or the Levenshtein distance between a pattern and a word. This function is exposed as spellfix1_editdist(X,Y). The edit distance function returns the "cost" of converting X into Y. Some transformations cost more than others. Changing one vowel into a different vowel, |
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characters into ASCII. Examples: "æ" -> "ae", "þ" -> "th", "ß" -> "ss", "á" -> "a", ... The accessory function spellfix1_translit(X) will do the non-ASCII to ASCII mapping. The built-in lower(X) function will convert to lower-case. Thus: k1 = lower(spellfix1_translit(word)). If the word is already all lower-case ASCII, then the k1 column will contain a NULL. This reduces the storage requirements for the %_vocab table and helps spellfix to run a little faster. Therefore, it is advantageous to populate as much of the spellfix table as possible using lower-case ASCII vocabulary. <dt><p><b>k2</b><dd> This field holds a phonetic code derived from coalesce(k1,word). Letters that have similar sounds are mapped into the same symbol. For example, all vowels and vowel clusters become the single symbol "A". And the letters "p", "b", "f", and "v" all become "B". All nasal sounds are represented as "N". And so forth. The mapping is based on ideas found in Soundex, Metaphone, and other long-standing phonetic matching systems. This key can be generated by the function spellfix1_phonehash(X). Hence: k2 = spellfix1_phonehash(coalesce(k1,word)) </dl> <p>There is also a function for computing the Wagner edit distance or the Levenshtein distance between a pattern and a word. This function is exposed as spellfix1_editdist(X,Y). The edit distance function returns the "cost" of converting X into Y. Some transformations cost more than others. Changing one vowel into a different vowel, |