| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Algebra.Additive
Synopsis
- class C a
- zero :: C a => a
- (+), (-) :: C a => a -> a -> a
- (+), (-) :: C a => a -> a -> a
- negate :: C a => a -> a
- subtract :: C a => a -> a -> a
- sum :: C a => [a] -> a
- sum1 :: C a => [a] -> a
- sumNestedAssociative :: C a => [a] -> a
- sumNestedCommutative :: C a => [a] -> a
- elementAdd :: C x => (v -> x) -> T (v, v) x
- elementSub :: C x => (v -> x) -> T (v, v) x
- elementNeg :: C x => (v -> x) -> T v x
- (<*>.+) :: C x => T (v, v) (x -> a) -> (v -> x) -> T (v, v) a
- (<*>.-) :: C x => T (v, v) (x -> a) -> (v -> x) -> T (v, v) a
- (<*>.-$) :: C x => T v (x -> a) -> (v -> x) -> T v a
- propAssociative :: (Eq a, C a) => a -> a -> a -> Bool
- propCommutative :: (Eq a, C a) => a -> a -> Bool
- propIdentity :: (Eq a, C a) => a -> Bool
- propInverse :: (Eq a, C a) => a -> Bool
Class
Additive a encapsulates the notion of a commutative group, specified by the following laws:
a + b === b + a
(a + b) + c === a + (b + c)
zero + a === a
a + negate a === 0
Typical examples include integers, dollars, and vectors.
Instances
| C Double Source # | |
| C Float Source # | |
| C Int Source # | |
| C Int8 Source # | |
| C Int16 Source # | |
| C Int32 Source # | |
| C Int64 Source # | |
| C Integer Source # | |
| C Word Source # | |
| C Word8 Source # | |
| C Word16 Source # | |
| C Word32 Source # | |
| C Word64 Source # | |
| C T Source # | |
| C T Source # | |
| C T Source # | |
| C T Source # | |
| C v => C [v] Source # | The |
| Integral a => C (Ratio a) Source # | |
| RealFloat a => C (Complex a) Source # | |
| (Ord a, C a) => C (T a) Source # | |
| C a => C (T a) Source # | |
| Num a => C (T a) Source # | |
| (Eq a, C a) => C (T a) Source # | |
| C a => C (T a) Source # | |
| (Eq a, C a) => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| (C a, C a) => C (T a) Source # | |
| (C a, C a, C a) => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C a => C (T a) Source # | |
| C v => C (b -> v) Source # | |
| (C v0, C v1) => C (v0, v1) Source # | |
| (Ord i, Eq v, C v) => C (Map i v) Source # | |
| (Ord a, C b) => C (T a b) Source # | |
| C v => C (T a v) Source # | |
| (C u, C a) => C (T u a) Source # | |
| (Ord i, C a) => C (T i a) Source # | |
| C v => C (T a v) Source # | |
| (C v0, C v1, C v2) => C (v0, v1, v2) Source # | |
subtract :: C a => a -> a -> a Source #
subtract is (-) with swapped operand order.
This is the operand order which will be needed in most cases
of partial application.
Complex functions
sum :: C a => [a] -> a Source #
Sum up all elements of a list. An empty list yields zero.
This function is inappropriate for number types like Peano.
Maybe we should make sum a method of Additive.
This would also make lengthLeft and lengthRight superfluous.
sum1 :: C a => [a] -> a Source #
Sum up all elements of a non-empty list. This avoids including a zero which is useful for types where no universal zero is available. ToDo: Should have NonEmpty type.
sumNestedAssociative :: C a => [a] -> a Source #
Sum the operands in an order, such that the dependencies are minimized. Does this have a measurably effect on speed?
Requires associativity.
sumNestedCommutative :: C a => [a] -> a Source #
Instance definition helpers
elementAdd :: C x => (v -> x) -> T (v, v) x Source #
Instead of baking the add operation into the element function,
we could use higher rank types
and pass a generic uncurry (+) to the run function.
We do not do so in order to stay Haskell 98
at least for parts of NumericPrelude.
elementSub :: C x => (v -> x) -> T (v, v) x Source #
elementNeg :: C x => (v -> x) -> T v x Source #
(<*>.+) :: C x => T (v, v) (x -> a) -> (v -> x) -> T (v, v) a infixl 4 Source #
addPair :: (Additive.C a, Additive.C b) => (a,b) -> (a,b) -> (a,b) addPair = Elem.run2 $ Elem.with (,) <*>.+ fst <*>.+ snd