Averages/Arithmetic mean: Difference between revisions
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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This function works if the element type is an instance of Fractional: |
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mean :: (Fractional a) => [a] -> a |
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mean [] = 0 |
mean [] = 0 |
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mean xs = sum xs / Data.List.genericLength xs |
mean xs = sum xs / Data.List.genericLength xs |
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But some types, e.g. integers, are not Fractional; the following function works for all Real types: |
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meanReals :: (Real a, Fractional b) => [a] -> b |
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meanReals = mean . map realToFrac |
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=={{header|IDL}}== |
=={{header|IDL}}== |
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