Cumulative standard deviation: Difference between revisions
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m (→{{header|Haskell}}: Tidying) |
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<lang Haskell>import Data.List (mapAccumL) |
<lang Haskell>import Data.List (mapAccumL) |
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-------------- CUMULATIVE STANDARD DEVIATION ------------- |
-------------- CUMULATIVE STANDARD DEVIATION ------------- |
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cumulativeStdDevns :: [Float] -> [Float] |
cumulativeStdDevns :: [Float] -> [Float] |
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cumulativeStdDevns |
cumulativeStdDevns = snd . mapAccumL go (0, 0) . zip [1.0..] |
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where |
where |
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go (s, q) (i, x) = |
go (s, q) (i, x) = |
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_q = q + (x ^ 2) |
_q = q + (x ^ 2) |
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in ((_s, _q), sqrt ((_q / i) - ((_s / i) ^ 2))) |
in ((_s, _q), sqrt ((_q / i) - ((_s / i) ^ 2))) |
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--------------------------- TEST ------------------------- |
--------------------------- TEST ------------------------- |
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main :: IO () |
main :: IO () |
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