limp-0.3.2.3: representation of Integer Linear Programs

Safe Haskell None Haskell2010

Numeric.Limp.Rep.Rep

Description

Representation of integers (Z) and reals (R) of similar precision. Programs are abstracted over this, so that ideally in the future we could have a solver that produces Integers and Rationals, instead of just Ints and Doubles.

We bundle Z and R up into a single representation instead of abstracting over both, because we must be able to convert from Z to R without loss.

Synopsis

# Documentation

class (Num (Z c), Ord (Z c), Eq (Z c), Integral (Z c), Num (R c), Ord (R c), Eq (R c), RealFrac (R c)) => Rep c where Source #

The Representation class. Requires its members Z c and R c to be Num, Ord and Eq.

For some reason, for type inference to work, the members must be data instead of type. This gives some minor annoyances when unpacking them. See unwrapR below.

Minimal complete definition

Nothing

Associated Types

data Z c Source #

Integers

data R c Source #

Real numbers

Methods

fromZ :: Z c -> R c Source #

Convert an integer to a real. This should not lose any precision. (whereas fromIntegral 1000 :: Word8 would lose precision)

Instances
 Source # Instance detailsDefined in Numeric.Limp.Rep.IntDouble Associated Typesdata Z IntDouble :: Type Source #data R IntDouble :: Type Source # Methods Source # Instance detailsDefined in Numeric.Limp.Rep.Arbitrary Associated Typesdata Z Arbitrary :: Type Source #data R Arbitrary :: Type Source # Methods

data Assignment z r c Source #

An assignment from variables to values. Maps integer variables to integers, and real variables to reals.

Constructors

 Assignment (Map z (Z c)) (Map r (R c))
Instances
 (Show (Z c), Show (R c), Show z, Show r) => Show (Assignment z r c) Source # Instance detailsDefined in Numeric.Limp.Rep.Rep MethodsshowsPrec :: Int -> Assignment z r c -> ShowS #show :: Assignment z r c -> String #showList :: [Assignment z r c] -> ShowS # (Ord z, Ord r) => Semigroup (Assignment z r c) Source # Instance detailsDefined in Numeric.Limp.Rep.Rep Methods(<>) :: Assignment z r c -> Assignment z r c -> Assignment z r c #sconcat :: NonEmpty (Assignment z r c) -> Assignment z r c #stimes :: Integral b => b -> Assignment z r c -> Assignment z r c # (Ord z, Ord r) => Monoid (Assignment z r c) Source # Instance detailsDefined in Numeric.Limp.Rep.Rep Methodsmempty :: Assignment z r c #mappend :: Assignment z r c -> Assignment z r c -> Assignment z r c #mconcat :: [Assignment z r c] -> Assignment z r c #

zOf :: (Rep c, Ord z) => Assignment z r c -> z -> Z c Source #

Retrieve value of integer variable - or 0, if there is no value.

rOf :: (Rep c, Ord r) => Assignment z r c -> r -> R c Source #

Retrieve value of real variable - or 0, if there is no value.

zrOf :: (Rep c, Ord z, Ord r) => Assignment z r c -> Either z r -> R c Source #

Retrieve value of an integer or real variable, with result cast to a real regardless.