Agda-2.6.20240714: A dependently typed functional programming language and proof assistant
Safe HaskellNone
LanguageHaskell2010

Agda.Termination.SparseMatrix

Description

Sparse matrices.

We assume the matrices to be very sparse, so we just implement them as sorted association lists.

Most operations are linear in the number of non-zero elements.

An exception is transposition, which needs to sort the association list again; it has the complexity of sorting: n log n where n is the number of non-zero elements.

Another exception is matrix multiplication, of course.

Synopsis

Basic data types

data Matrix i b Source #

Type of matrices, parameterised on the type of values.

Sparse matrices are implemented as an ordered association list, mapping coordinates to values.

Constructors

Matrix (Size i) [(MIx i, b)] 

Instances

Instances details
Functor (Matrix i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

fmap :: (a -> b) -> Matrix i a -> Matrix i b

(<$) :: a -> Matrix i b -> Matrix i a #

Foldable (Matrix i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

fold :: Monoid m => Matrix i m -> m

foldMap :: Monoid m => (a -> m) -> Matrix i a -> m

foldMap' :: Monoid m => (a -> m) -> Matrix i a -> m

foldr :: (a -> b -> b) -> b -> Matrix i a -> b

foldr' :: (a -> b -> b) -> b -> Matrix i a -> b

foldl :: (b -> a -> b) -> b -> Matrix i a -> b

foldl' :: (b -> a -> b) -> b -> Matrix i a -> b

foldr1 :: (a -> a -> a) -> Matrix i a -> a

foldl1 :: (a -> a -> a) -> Matrix i a -> a

toList :: Matrix i a -> [a]

null :: Matrix i a -> Bool

length :: Matrix i a -> Int

elem :: Eq a => a -> Matrix i a -> Bool

maximum :: Ord a => Matrix i a -> a

minimum :: Ord a => Matrix i a -> a

sum :: Num a => Matrix i a -> a

product :: Num a => Matrix i a -> a

Traversable (Matrix i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

traverse :: Applicative f => (a -> f b) -> Matrix i a -> f (Matrix i b)

sequenceA :: Applicative f => Matrix i (f a) -> f (Matrix i a)

mapM :: Monad m => (a -> m b) -> Matrix i a -> m (Matrix i b)

sequence :: Monad m => Matrix i (m a) -> m (Matrix i a)

(Integral i, HasZero b, Pretty b) => Pretty (Matrix i b) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

pretty :: Matrix i b -> Doc Source #

prettyPrec :: Int -> Matrix i b -> Doc Source #

prettyList :: [Matrix i b] -> Doc Source #

(Ord i, HasZero o, NotWorse o) => NotWorse (Matrix i o) Source #

We assume the matrices have the same dimension.

Instance details

Defined in Agda.Termination.Order

Methods

notWorse :: Matrix i o -> Matrix i o -> Bool Source #

(Ord i, PartialOrd a) => PartialOrd (Matrix i a) Source #

Pointwise comparison. Only matrices with the same dimension are comparable.

Instance details

Defined in Agda.Termination.SparseMatrix

(Integral i, HasZero b, Show i, Show b) => Show (Matrix i b) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

showsPrec :: Int -> Matrix i b -> ShowS

show :: Matrix i b -> String

showList :: [Matrix i b] -> ShowS

(Eq i, Eq b) => Eq (Matrix i b) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

(==) :: Matrix i b -> Matrix i b -> Bool

(/=) :: Matrix i b -> Matrix i b -> Bool

(Ord i, Ord b) => Ord (Matrix i b) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

compare :: Matrix i b -> Matrix i b -> Ordering

(<) :: Matrix i b -> Matrix i b -> Bool

(<=) :: Matrix i b -> Matrix i b -> Bool

(>) :: Matrix i b -> Matrix i b -> Bool

(>=) :: Matrix i b -> Matrix i b -> Bool

max :: Matrix i b -> Matrix i b -> Matrix i b

min :: Matrix i b -> Matrix i b -> Matrix i b

(Integral i, HasZero b) => Diagonal (Matrix i b) b Source #

Diagonal of sparse matrix.

O(n) where n is the number of non-zero elements in the matrix.

Instance details

Defined in Agda.Termination.SparseMatrix

Methods

diagonal :: Matrix i b -> [b] Source #

unM :: Matrix i b -> [(MIx i, b)] Source #

Association of indices to values.

data Size i Source #

Size of a matrix.

Constructors

Size 

Fields

  • rows :: i

    Number of rows, >= 0.

  • cols :: i

    Number of columns, >= 0.

Instances

Instances details
Show i => Show (Size i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

showsPrec :: Int -> Size i -> ShowS

show :: Size i -> String

showList :: [Size i] -> ShowS

Eq i => Eq (Size i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

(==) :: Size i -> Size i -> Bool

(/=) :: Size i -> Size i -> Bool

Ord i => Ord (Size i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

compare :: Size i -> Size i -> Ordering

(<) :: Size i -> Size i -> Bool

(<=) :: Size i -> Size i -> Bool

(>) :: Size i -> Size i -> Bool

(>=) :: Size i -> Size i -> Bool

max :: Size i -> Size i -> Size i

min :: Size i -> Size i -> Size i

data MIx i Source #

Type of matrix indices (row, column).

Constructors

MIx 

Fields

  • row :: i

    Row index, 1 <= row <= rows.

  • col :: i

    Column index 1 <= col <= cols.

Instances

Instances details
Ix i => Ix (MIx i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

range :: (MIx i, MIx i) -> [MIx i] #

index :: (MIx i, MIx i) -> MIx i -> Int #

unsafeIndex :: (MIx i, MIx i) -> MIx i -> Int

inRange :: (MIx i, MIx i) -> MIx i -> Bool #

rangeSize :: (MIx i, MIx i) -> Int #

unsafeRangeSize :: (MIx i, MIx i) -> Int

Show i => Show (MIx i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

showsPrec :: Int -> MIx i -> ShowS

show :: MIx i -> String

showList :: [MIx i] -> ShowS

Eq i => Eq (MIx i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

(==) :: MIx i -> MIx i -> Bool

(/=) :: MIx i -> MIx i -> Bool

Ord i => Ord (MIx i) Source # 
Instance details

Defined in Agda.Termination.SparseMatrix

Methods

compare :: MIx i -> MIx i -> Ordering

(<) :: MIx i -> MIx i -> Bool

(<=) :: MIx i -> MIx i -> Bool

(>) :: MIx i -> MIx i -> Bool

(>=) :: MIx i -> MIx i -> Bool

max :: MIx i -> MIx i -> MIx i

min :: MIx i -> MIx i -> MIx i

Generating and creating matrices

fromLists :: (Ord i, Num i, Enum i, HasZero b) => Size i -> [[b]] -> Matrix i b Source #

fromLists sz rs constructs a matrix from a list of lists of values (a list of rows). O(size) where size = rows × cols.

Precondition: length rs == rows sz and all ((cols sz ==) . length) rs.

fromIndexList :: (Ord i, HasZero b) => Size i -> [(MIx i, b)] -> Matrix i b Source #

Constructs a matrix from a list of (index, value)-pairs. O(n) where n is size of the list.

Precondition: indices are unique.

toLists :: (Integral i, HasZero b) => Matrix i b -> [[b]] Source #

Converts a matrix to a list of row lists. O(size) where size = rows × cols.

Combining and querying matrices

size :: Matrix i b -> Size i Source #

Dimensions of the matrix.

square :: Ix i => Matrix i b -> Bool Source #

True iff the matrix is square.

isEmpty :: (Num i, Ix i) => Matrix i b -> Bool Source #

Returns True iff the matrix is empty.

isSingleton :: (Eq i, Num i, HasZero b) => Matrix i b -> Maybe b Source #

Returns 'Just b' iff it is a 1x1 matrix with just one entry b. O(1).

zipMatrices Source #

Arguments

:: forall a b c i. Ord i 
=> (a -> c)

Element only present in left matrix.

-> (b -> c)

Element only present in right matrix.

-> (a -> b -> c)

Element present in both matrices.

-> (c -> Bool)

Result counts as zero?

-> Matrix i a 
-> Matrix i b 
-> Matrix i c 

General pointwise combination function for sparse matrices. O(n1 + n2).

add :: (Ord i, HasZero a) => (a -> a -> a) -> Matrix i a -> Matrix i a -> Matrix i a Source #

add (+) m1 m2 adds m1 and m2, using (+) to add values. O(n1 + n2).

Returns a matrix of size supSize m1 m2.

intersectWith :: Ord i => (a -> a -> a) -> Matrix i a -> Matrix i a -> Matrix i a Source #

intersectWith f m1 m2 build the pointwise conjunction m1 and m2. Uses f to combine non-zero values. O(n1 + n2).

Returns a matrix of size infSize m1 m2.

interAssocWith :: Ord i => (a -> a -> a) -> [(i, a)] -> [(i, a)] -> [(i, a)] Source #

Association list intersection. O(n1 + n2).

interAssocWith f l l' = { (i, f a b) | (i,a) ∈ l and (i,b) ∈ l' }

Used to combine sparse matrices, it might introduce zero elements if f can return zero for non-zero arguments.

mul :: (Ix i, Eq a) => Semiring a -> Matrix i a -> Matrix i a -> Matrix i a Source #

mul semiring m1 m2 multiplies matrices m1 and m2. Uses the operations of the semiring semiring to perform the multiplication.

O(n1 + n2 log n2 + Σ(i <= r1) Σ(j <= c2) d(i,j)) where r1 is the number of non-empty rows in m1 and c2 is the number of non-empty columns in m2 and d(i,j) is the bigger one of the following two quantifies: the length of sparse row i in m1 and the length of sparse column j in m2.

Given dimensions m1 : r1 × c1 and m2 : r2 × c2, a matrix of size r1 × c2 is returned. It is not necessary that c1 == r2, the matrices are implicitly patched with zeros to match up for multiplication. For sparse matrices, this patching is a no-op.

transpose :: Transpose a => a -> a Source #

class Diagonal m e | m -> e where Source #

diagonal m extracts the diagonal of m.

For non-square matrices, the length of the diagonal is the minimum of the dimensions of the matrix.

Methods

diagonal :: m -> [e] Source #

Instances

Instances details
HasZero a => Diagonal (CallMatrix' a) a Source # 
Instance details

Defined in Agda.Termination.CallMatrix

Methods

diagonal :: CallMatrix' a -> [a] Source #

Diagonal (CallMatrixAug cinfo) Order Source # 
Instance details

Defined in Agda.Termination.CallMatrix

Methods

diagonal :: CallMatrixAug cinfo -> [Order] Source #

(Integral i, HasZero b) => Diagonal (Matrix i b) b Source #

Diagonal of sparse matrix.

O(n) where n is the number of non-zero elements in the matrix.

Instance details

Defined in Agda.Termination.SparseMatrix

Methods

diagonal :: Matrix i b -> [b] Source #

toSparseRows :: Eq i => Matrix i b -> [(i, [(i, b)])] Source #

Converts a sparse matrix to a sparse list of rows. O(n) where n is the number of non-zero entries of the matrix.

Only non-empty rows are generated.

supSize :: Ord i => Matrix i a -> Matrix i b -> Size i Source #

Compute the matrix size of the union of two matrices.

zipAssocWith Source #

Arguments

:: Ord i 
=> ([(i, a)] -> [(i, c)])

Only left map remaining.

-> ([(i, b)] -> [(i, c)])

Only right map remaining.

-> (a -> Maybe c)

Element only present in left map.

-> (b -> Maybe c)

Element only present in right map.

-> (a -> b -> Maybe c)

Element present in both maps.

-> [(i, a)] 
-> [(i, b)] 
-> [(i, c)] 

General pointwise combination function for association lists. O(n1 + n2) where ni is the number of non-zero element in matrix i.

In zipAssocWith fs gs f g h l l',

fs is possibly more efficient version of mapMaybe ( (i, a) -> (i,) $ f a), and same for gs and g.

Modifying matrices

addRow :: (Num i, HasZero b) => b -> Matrix i b -> Matrix i b Source #

addRow x m adds a new row to m, after the rows already existing in the matrix. All elements in the new row get set to x.

addColumn :: (Num i, HasZero b) => b -> Matrix i b -> Matrix i b Source #

addColumn x m adds a new column to m, after the columns already existing in the matrix. All elements in the new column get set to x.