On Wed, 26 Sep 2007, ChrisK wrote:
ok wrote:
There are a number of interesting issues raised by mbeddoe's Math.Statistics.
data (Floating a, Ord a) => Simple_Continuous_Variate a = SCV [a] Int a a (Array Int a)
list_to_variate xs = SCV xs n m s o where n = length xs m = sum xs / fromIntegral n s = sum [(x - m)^2 | x <- xs] / fromIntegral (n - 1) o = listArray (1,n) (sort xs)
vLength (SCV _ n _ _ _) = n vMean (SCV _ _ m _ _) = m vSd (SCV _ _ _ s _) = s vMin (SCV _ _ _ _ a) = a ! 1 vMax (SCV _ n _ _ a) = a ! n vRange scv = vMax scv - vMin scv vMedian (SCV _ n _ _ a) | odd n = a ! ((n+1)`div`2) | even n = ((a ! l) + (a ! u))/2 where l = n `div` 2 u = n - l .....
Math.Statistics eats many good names. I would also suggest offering a type class interface. Then you could operate on various containers besides a list:
If it's only about polymorphic list types, a type class for general list types may be enough. This works without multi-parameter type class. http://software.complete.org/listlike/ Maybe it can be generalized to Foldable. http://www.haskell.org/haskellwiki/Use_of_language_extensions