봐 (!*!)
의 유형
(!*!) :: (Functor m, Foldable t, Additive t, Additive n, Num a)
=> m (t a) -> t (n a) -> m (n a)
중요한 제약 조건이 여기 Additive
이기 때문에, 그래서 당신은 그냥 중첩 된 목록을 사용할 수의 인스턴스
instance Additive []
instance Additive Vector -- ordinary, unsized vectors from the vectors package
instance Additive V0
instance Additive V1
instance Additive V2
instance Additive V3
instance Additive V4 -- Sized vectors from linear up to n = 4
instance Dim n => Additive (V n) -- Vectors of arbitrary dimension where the size is given by a type level number n
-- plus other instances
을 살펴에서 :
m :: [[Int]]
m = [ [ 0,1,2,3,4 ],
[ 1,2,3,4,0 ],
[ 2,3,4,0,1 ],
[ 3,4,0,1,2 ],
[ 4,0,1,2,3 ] ]
msq :: [[Int]]
msq = m !*! m
을
또는 중첩 Vectors
import Data.Vector(Vector)
import qualified Data.Vector as V
mv :: Vector (Vector Int)
mv = V.fromList $ V.fromList <$> m
mvsq :: Vector (Vector Int)
mvsq = mv !*! mv
또는 믹스 앤 매치 :
mvl :: Vector [Int]
mvl = V.fromList m
mlv :: [Vector Int]
mlv = V.fromList <$> m
mvlmlv :: Vector (Vector Int)
mvlmlv = mvl !*! mlv
그리고 당신은 크기의 트랙을 유지하기 위해 V
를 사용할 수 있습니다
{-# LANGUAGE DataKinds #-}
import Linear.V
mV :: V 5 (V 5 Int) -- GHC.TypeLits.Nat literals
mV = fromJust $ fromVector $ fromJust <$> fromVector <$> mv
mVsq :: V 5 (V 5 Int)
mVsq = mV !*! mV -- does not compile in case of dimension mismatch
을