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Ingy döt Net 2013-04-10 14:58:50 -07:00
parent 2dd7375f96
commit 051504d65b
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Task/Averages-Arithmetic-mean/Haskell/averages-arithmetic-mean-1.hs Normal file
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mean :: (Fractional a) => [a] -> a
mean [] = 0
mean xs = sum xs / Data.List.genericLength xs

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Task/Averages-Arithmetic-mean/Haskell/averages-arithmetic-mean-2.hs Normal file
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meanReals :: (Real a, Fractional b) => [a] -> b
meanReals = mean . map realToFrac

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Task/Averages-Arithmetic-mean/Haskell/averages-arithmetic-mean-3.hs Normal file
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{-# LANGUAGE BangPatterns #-}
import Data.List (foldl')
mean :: (Real n, Fractional m) => [n] -> m
mean xs = let (s,l) = foldl' f (0, 0) xs in realToFrac s / l
where f (!s,!l) x = (s+x,l+1)