Jaro similarity: Difference between revisions
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(→{{header|Haskell}}: Reduced a case analysis to a `>>=` bind) |
m (→{{header|Haskell}}: white space and layout) |
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import Text.Printf (printf) |
import Text.Printf (printf) |
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import Data.Maybe (mapMaybe) |
import Data.Maybe (mapMaybe) |
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jaro :: String -> String -> Float |
jaro :: String -> String -> Float |
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jaro x y = |
jaro x y = |
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0 -> 0 |
0 -> 0 |
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_ -> (1 / 3) * ((m / s1) + (m / s2) + ((m - t) / m)) |
_ -> (1 / 3) * ((m / s1) + (m / s2) + ((m - t) / m)) |
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matches :: String -> String -> [(Int, Char)] |
matches :: String -> String -> [(Int, Char)] |
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matches s1 s2 = |
matches s1 s2 = |
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(\(c, n) -> |
(\(c, n) -> |
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let offset = max 0 (n - (r + 1)) -- initial chars out of range ? |
let offset = max 0 (n - (r + 1)) -- initial chars out of range ? |
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-- Any |
-- Any offset for this char within range. |
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in elemIndex c (drop offset (take (n + r) ys)) >>= |
in elemIndex c (drop offset (take (n + r) ys)) >>= |
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(\i -> Just (offset + i, c))) |
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(zip xs [1 ..]) |
(zip xs [1 ..]) |
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transpositions :: [(Int, Char)] -> Int |
transpositions :: [(Int, Char)] -> Int |
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transpositions = length . filter (uncurry (>)) . (zip <*> tail) |
transpositions = length . filter (uncurry (>)) . (zip <*> tail) |
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-- TEST ---------------------------------------------------------------------- |
-- TEST ---------------------------------------------------------------------- |
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main :: IO () |
main :: IO () |
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