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{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, FlexibleContexts, TypeOperators #-}
module Numeric.Additive.Group
( -- * Additive Groups
Group(..)
) where
import Data.Int
import Data.Word
import Data.Key
import Data.Functor.Representable.Trie
import Prelude hiding ((*), (+), (-), negate, subtract,zipWith)
import qualified Prelude
import Numeric.Additive.Class
import Numeric.Algebra.Class
infixl 6 -
infixl 7 `times`
class (LeftModule Integer r, RightModule Integer r, Monoidal r) => Group r where
(-) :: r -> r -> r
negate :: r -> r
subtract :: r -> r -> r
times :: Integral n => n -> r -> r
times y0 x0 = case compare y0 0 of
LT -> f (negate x0) (Prelude.negate y0)
EQ -> zero
GT -> f x0 y0
where
f x y
| even y = f (x + x) (y `quot` 2)
| y == 1 = x
| otherwise = g (x + x) ((y Prelude.- 1) `quot` 2) x
g x y z
| even y = g (x + x) (y `quot` 2) z
| y == 1 = x + z
| otherwise = g (x + x) ((y Prelude.- 1) `quot` 2) (x + z)
negate a = zero - a
a - b = a + negate b
subtract a b = negate a + b
instance Group r => Group (e -> r) where
f - g = \x -> f x - g x
negate f x = negate (f x)
subtract f g x = subtract (f x) (g x)
times n f e = times n (f e)
instance (HasTrie e, Group r) => Group (e :->: r) where
(-) = zipWith (-)
negate = fmap negate
subtract = zipWith subtract
times = fmap . times
instance Group Integer where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Int where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Int8 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Int16 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Int32 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Int64 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Word where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Word8 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Word16 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Word32 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group Word64 where
(-) = (Prelude.-)
negate = Prelude.negate
subtract = Prelude.subtract
times n r = fromIntegral n * r
instance Group () where
_ - _ = ()
negate _ = ()
subtract _ _ = ()
times _ _ = ()
instance (Group a, Group b) => Group (a,b) where
negate (a,b) = (negate a, negate b)
(a,b) - (i,j) = (a-i, b-j)
subtract (a,b) (i,j) = (subtract a i, subtract b j)
times n (a,b) = (times n a,times n b)
instance (Group a, Group b, Group c) => Group (a,b,c) where
negate (a,b,c) = (negate a, negate b, negate c)
(a,b,c) - (i,j,k) = (a-i, b-j, c-k)
subtract (a,b,c) (i,j,k) = (subtract a i, subtract b j, subtract c k)
times n (a,b,c) = (times n a,times n b, times n c)
instance (Group a, Group b, Group c, Group d) => Group (a,b,c,d) where
negate (a,b,c,d) = (negate a, negate b, negate c, negate d)
(a,b,c,d) - (i,j,k,l) = (a-i, b-j, c-k, d-l)
subtract (a,b,c,d) (i,j,k,l) = (subtract a i, subtract b j, subtract c k, subtract d l)
times n (a,b,c,d) = (times n a,times n b, times n c, times n d)
instance (Group a, Group b, Group c, Group d, Group e) => Group (a,b,c,d,e) where
negate (a,b,c,d,e) = (negate a, negate b, negate c, negate d, negate e)
(a,b,c,d,e) - (i,j,k,l,m) = (a-i, b-j, c-k, d-l, e-m)
subtract (a,b,c,d,e) (i,j,k,l,m) = (subtract a i, subtract b j, subtract c k, subtract d l, subtract e m)
times n (a,b,c,d,e) = (times n a,times n b, times n c, times n d, times n e)
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