Copyright  (c) Roman Leshchinskiy 20082010 Alexey Kuleshevich 20202022 Aleksey Khudyakov 20202022 Andrew Lelechenko 20202022 

License  BSDstyle 
Maintainer  Haskell Libraries Team <libraries@haskell.org> 
Stability  experimental 
Portability  nonportable 
Safe Haskell  None 
Language  Haskell2010 
Generic interface to immutable vectors.
Synopsis
 class MVector (Mutable v) a => Vector v a where
 basicUnsafeFreeze :: Mutable v s a > ST s (v a)
 basicUnsafeThaw :: v a > ST s (Mutable v s a)
 basicLength :: v a > Int
 basicUnsafeSlice :: Int > Int > v a > v a
 basicUnsafeIndexM :: v a > Int > Box a
 basicUnsafeCopy :: Mutable v s a > v a > ST s ()
 elemseq :: v a > a > b > b
 type family Mutable (v :: Type > Type) = (mv :: Type > Type > Type)  mv > v
 length :: Vector v a => v a > Int
 null :: Vector v a => v a > Bool
 (!) :: (HasCallStack, Vector v a) => v a > Int > a
 (!?) :: Vector v a => v a > Int > Maybe a
 head :: Vector v a => v a > a
 last :: Vector v a => v a > a
 unsafeIndex :: Vector v a => v a > Int > a
 unsafeHead :: Vector v a => v a > a
 unsafeLast :: Vector v a => v a > a
 indexM :: (HasCallStack, Vector v a, Monad m) => v a > Int > m a
 headM :: (Vector v a, Monad m) => v a > m a
 lastM :: (Vector v a, Monad m) => v a > m a
 unsafeIndexM :: (Vector v a, Monad m) => v a > Int > m a
 unsafeHeadM :: (Vector v a, Monad m) => v a > m a
 unsafeLastM :: (Vector v a, Monad m) => v a > m a
 slice :: (HasCallStack, Vector v a) => Int > Int > v a > v a
 init :: Vector v a => v a > v a
 tail :: Vector v a => v a > v a
 take :: Vector v a => Int > v a > v a
 drop :: Vector v a => Int > v a > v a
 splitAt :: Vector v a => Int > v a > (v a, v a)
 uncons :: Vector v a => v a > Maybe (a, v a)
 unsnoc :: Vector v a => v a > Maybe (v a, a)
 unsafeSlice :: Vector v a => Int > Int > v a > v a
 unsafeInit :: Vector v a => v a > v a
 unsafeTail :: Vector v a => v a > v a
 unsafeTake :: Vector v a => Int > v a > v a
 unsafeDrop :: Vector v a => Int > v a > v a
 empty :: Vector v a => v a
 singleton :: forall v a. Vector v a => a > v a
 replicate :: forall v a. Vector v a => Int > a > v a
 generate :: Vector v a => Int > (Int > a) > v a
 iterateN :: Vector v a => Int > (a > a) > a > v a
 replicateM :: (Monad m, Vector v a) => Int > m a > m (v a)
 generateM :: (Monad m, Vector v a) => Int > (Int > m a) > m (v a)
 iterateNM :: (Monad m, Vector v a) => Int > (a > m a) > a > m (v a)
 create :: Vector v a => (forall s. ST s (Mutable v s a)) > v a
 createT :: (Traversable f, Vector v a) => (forall s. ST s (f (Mutable v s a))) > f (v a)
 unfoldr :: Vector v a => (b > Maybe (a, b)) > b > v a
 unfoldrN :: Vector v a => Int > (b > Maybe (a, b)) > b > v a
 unfoldrExactN :: Vector v a => Int > (b > (a, b)) > b > v a
 unfoldrM :: (Monad m, Vector v a) => (b > m (Maybe (a, b))) > b > m (v a)
 unfoldrNM :: (Monad m, Vector v a) => Int > (b > m (Maybe (a, b))) > b > m (v a)
 unfoldrExactNM :: (Monad m, Vector v a) => Int > (b > m (a, b)) > b > m (v a)
 constructN :: forall v a. Vector v a => Int > (v a > a) > v a
 constructrN :: forall v a. Vector v a => Int > (v a > a) > v a
 enumFromN :: (Vector v a, Num a) => a > Int > v a
 enumFromStepN :: forall v a. (Vector v a, Num a) => a > a > Int > v a
 enumFromTo :: (Vector v a, Enum a) => a > a > v a
 enumFromThenTo :: (Vector v a, Enum a) => a > a > a > v a
 cons :: forall v a. Vector v a => a > v a > v a
 snoc :: forall v a. Vector v a => v a > a > v a
 (++) :: Vector v a => v a > v a > v a
 concat :: Vector v a => [v a] > v a
 concatNE :: Vector v a => NonEmpty (v a) > v a
 force :: Vector v a => v a > v a
 (//) :: Vector v a => v a > [(Int, a)] > v a
 update :: (Vector v a, Vector v (Int, a)) => v a > v (Int, a) > v a
 update_ :: (Vector v a, Vector v Int) => v a > v Int > v a > v a
 unsafeUpd :: Vector v a => v a > [(Int, a)] > v a
 unsafeUpdate :: (Vector v a, Vector v (Int, a)) => v a > v (Int, a) > v a
 unsafeUpdate_ :: (Vector v a, Vector v Int) => v a > v Int > v a > v a
 accum :: Vector v a => (a > b > a) > v a > [(Int, b)] > v a
 accumulate :: (Vector v a, Vector v (Int, b)) => (a > b > a) > v a > v (Int, b) > v a
 accumulate_ :: (Vector v a, Vector v Int, Vector v b) => (a > b > a) > v a > v Int > v b > v a
 unsafeAccum :: Vector v a => (a > b > a) > v a > [(Int, b)] > v a
 unsafeAccumulate :: (Vector v a, Vector v (Int, b)) => (a > b > a) > v a > v (Int, b) > v a
 unsafeAccumulate_ :: (Vector v a, Vector v Int, Vector v b) => (a > b > a) > v a > v Int > v b > v a
 reverse :: Vector v a => v a > v a
 backpermute :: forall v a. (HasCallStack, Vector v a, Vector v Int) => v a > v Int > v a
 unsafeBackpermute :: (Vector v a, Vector v Int) => v a > v Int > v a
 modify :: Vector v a => (forall s. Mutable v s a > ST s ()) > v a > v a
 indexed :: (Vector v a, Vector v (Int, a)) => v a > v (Int, a)
 map :: (Vector v a, Vector v b) => (a > b) > v a > v b
 imap :: (Vector v a, Vector v b) => (Int > a > b) > v a > v b
 concatMap :: (Vector v a, Vector v b) => (a > v b) > v a > v b
 mapM :: (Monad m, Vector v a, Vector v b) => (a > m b) > v a > m (v b)
 imapM :: (Monad m, Vector v a, Vector v b) => (Int > a > m b) > v a > m (v b)
 mapM_ :: (Monad m, Vector v a) => (a > m b) > v a > m ()
 imapM_ :: (Monad m, Vector v a) => (Int > a > m b) > v a > m ()
 forM :: (Monad m, Vector v a, Vector v b) => v a > (a > m b) > m (v b)
 forM_ :: (Monad m, Vector v a) => v a > (a > m b) > m ()
 iforM :: (Monad m, Vector v a, Vector v b) => v a > (Int > a > m b) > m (v b)
 iforM_ :: (Monad m, Vector v a) => v a > (Int > a > m b) > m ()
 zipWith :: (Vector v a, Vector v b, Vector v c) => (a > b > c) > v a > v b > v c
 zipWith3 :: (Vector v a, Vector v b, Vector v c, Vector v d) => (a > b > c > d) > v a > v b > v c > v d
 zipWith4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e) => (a > b > c > d > e) > v a > v b > v c > v d > v e
 zipWith5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f) => (a > b > c > d > e > f) > v a > v b > v c > v d > v e > v f
 zipWith6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v g) => (a > b > c > d > e > f > g) > v a > v b > v c > v d > v e > v f > v g
 izipWith :: (Vector v a, Vector v b, Vector v c) => (Int > a > b > c) > v a > v b > v c
 izipWith3 :: (Vector v a, Vector v b, Vector v c, Vector v d) => (Int > a > b > c > d) > v a > v b > v c > v d
 izipWith4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e) => (Int > a > b > c > d > e) > v a > v b > v c > v d > v e
 izipWith5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f) => (Int > a > b > c > d > e > f) > v a > v b > v c > v d > v e > v f
 izipWith6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v g) => (Int > a > b > c > d > e > f > g) > v a > v b > v c > v d > v e > v f > v g
 zip :: (Vector v a, Vector v b, Vector v (a, b)) => v a > v b > v (a, b)
 zip3 :: (Vector v a, Vector v b, Vector v c, Vector v (a, b, c)) => v a > v b > v c > v (a, b, c)
 zip4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v (a, b, c, d)) => v a > v b > v c > v d > v (a, b, c, d)
 zip5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v (a, b, c, d, e)) => v a > v b > v c > v d > v e > v (a, b, c, d, e)
 zip6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v (a, b, c, d, e, f)) => v a > v b > v c > v d > v e > v f > v (a, b, c, d, e, f)
 zipWithM :: (Monad m, Vector v a, Vector v b, Vector v c) => (a > b > m c) > v a > v b > m (v c)
 izipWithM :: (Monad m, Vector v a, Vector v b, Vector v c) => (Int > a > b > m c) > v a > v b > m (v c)
 zipWithM_ :: (Monad m, Vector v a, Vector v b) => (a > b > m c) > v a > v b > m ()
 izipWithM_ :: (Monad m, Vector v a, Vector v b) => (Int > a > b > m c) > v a > v b > m ()
 unzip :: (Vector v a, Vector v b, Vector v (a, b)) => v (a, b) > (v a, v b)
 unzip3 :: (Vector v a, Vector v b, Vector v c, Vector v (a, b, c)) => v (a, b, c) > (v a, v b, v c)
 unzip4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v (a, b, c, d)) => v (a, b, c, d) > (v a, v b, v c, v d)
 unzip5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v (a, b, c, d, e)) => v (a, b, c, d, e) > (v a, v b, v c, v d, v e)
 unzip6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v (a, b, c, d, e, f)) => v (a, b, c, d, e, f) > (v a, v b, v c, v d, v e, v f)
 filter :: Vector v a => (a > Bool) > v a > v a
 ifilter :: Vector v a => (Int > a > Bool) > v a > v a
 filterM :: (Monad m, Vector v a) => (a > m Bool) > v a > m (v a)
 uniq :: (Vector v a, Eq a) => v a > v a
 mapMaybe :: (Vector v a, Vector v b) => (a > Maybe b) > v a > v b
 imapMaybe :: (Vector v a, Vector v b) => (Int > a > Maybe b) > v a > v b
 mapMaybeM :: (Monad m, Vector v a, Vector v b) => (a > m (Maybe b)) > v a > m (v b)
 imapMaybeM :: (Monad m, Vector v a, Vector v b) => (Int > a > m (Maybe b)) > v a > m (v b)
 takeWhile :: Vector v a => (a > Bool) > v a > v a
 dropWhile :: Vector v a => (a > Bool) > v a > v a
 partition :: Vector v a => (a > Bool) > v a > (v a, v a)
 partitionWith :: (Vector v a, Vector v b, Vector v c) => (a > Either b c) > v a > (v b, v c)
 unstablePartition :: Vector v a => (a > Bool) > v a > (v a, v a)
 span :: Vector v a => (a > Bool) > v a > (v a, v a)
 break :: Vector v a => (a > Bool) > v a > (v a, v a)
 groupBy :: Vector v a => (a > a > Bool) > v a > [v a]
 group :: (Vector v a, Eq a) => v a > [v a]
 elem :: (Vector v a, Eq a) => a > v a > Bool
 notElem :: (Vector v a, Eq a) => a > v a > Bool
 find :: Vector v a => (a > Bool) > v a > Maybe a
 findIndex :: Vector v a => (a > Bool) > v a > Maybe Int
 findIndexR :: Vector v a => (a > Bool) > v a > Maybe Int
 findIndices :: (Vector v a, Vector v Int) => (a > Bool) > v a > v Int
 elemIndex :: (Vector v a, Eq a) => a > v a > Maybe Int
 elemIndices :: (Vector v a, Vector v Int, Eq a) => a > v a > v Int
 foldl :: Vector v b => (a > b > a) > a > v b > a
 foldl1 :: Vector v a => (a > a > a) > v a > a
 foldl' :: Vector v b => (a > b > a) > a > v b > a
 foldl1' :: Vector v a => (a > a > a) > v a > a
 foldr :: Vector v a => (a > b > b) > b > v a > b
 foldr1 :: Vector v a => (a > a > a) > v a > a
 foldr' :: Vector v a => (a > b > b) > b > v a > b
 foldr1' :: Vector v a => (a > a > a) > v a > a
 ifoldl :: Vector v b => (a > Int > b > a) > a > v b > a
 ifoldl' :: Vector v b => (a > Int > b > a) > a > v b > a
 ifoldr :: Vector v a => (Int > a > b > b) > b > v a > b
 ifoldr' :: Vector v a => (Int > a > b > b) > b > v a > b
 foldMap :: (Monoid m, Vector v a) => (a > m) > v a > m
 foldMap' :: (Monoid m, Vector v a) => (a > m) > v a > m
 all :: Vector v a => (a > Bool) > v a > Bool
 any :: Vector v a => (a > Bool) > v a > Bool
 and :: Vector v Bool => v Bool > Bool
 or :: Vector v Bool => v Bool > Bool
 sum :: (Vector v a, Num a) => v a > a
 product :: (Vector v a, Num a) => v a > a
 maximum :: (Vector v a, Ord a) => v a > a
 maximumBy :: Vector v a => (a > a > Ordering) > v a > a
 maximumOn :: (Ord b, Vector v a) => (a > b) > v a > a
 minimum :: (Vector v a, Ord a) => v a > a
 minimumBy :: Vector v a => (a > a > Ordering) > v a > a
 minimumOn :: (Ord b, Vector v a) => (a > b) > v a > a
 minIndex :: (Vector v a, Ord a) => v a > Int
 minIndexBy :: Vector v a => (a > a > Ordering) > v a > Int
 maxIndex :: (Vector v a, Ord a) => v a > Int
 maxIndexBy :: Vector v a => (a > a > Ordering) > v a > Int
 foldM :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m a
 ifoldM :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m a
 foldM' :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m a
 ifoldM' :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m a
 fold1M :: (Monad m, Vector v a) => (a > a > m a) > v a > m a
 fold1M' :: (Monad m, Vector v a) => (a > a > m a) > v a > m a
 foldM_ :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m ()
 ifoldM_ :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m ()
 foldM'_ :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m ()
 ifoldM'_ :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m ()
 fold1M_ :: (Monad m, Vector v a) => (a > a > m a) > v a > m ()
 fold1M'_ :: (Monad m, Vector v a) => (a > a > m a) > v a > m ()
 sequence :: (Monad m, Vector v a, Vector v (m a)) => v (m a) > m (v a)
 sequence_ :: (Monad m, Vector v (m a)) => v (m a) > m ()
 prescanl :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 prescanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 postscanl :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 postscanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 scanl :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 scanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a
 scanl1 :: Vector v a => (a > a > a) > v a > v a
 scanl1' :: Vector v a => (a > a > a) > v a > v a
 iscanl :: (Vector v a, Vector v b) => (Int > a > b > a) > a > v b > v a
 iscanl' :: (Vector v a, Vector v b) => (Int > a > b > a) > a > v b > v a
 prescanr :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 prescanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 postscanr :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 postscanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 scanr :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 scanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b
 scanr1 :: Vector v a => (a > a > a) > v a > v a
 scanr1' :: Vector v a => (a > a > a) > v a > v a
 iscanr :: (Vector v a, Vector v b) => (Int > a > b > b) > b > v a > v b
 iscanr' :: (Vector v a, Vector v b) => (Int > a > b > b) > b > v a > v b
 toList :: Vector v a => v a > [a]
 fromList :: Vector v a => [a] > v a
 fromListN :: Vector v a => Int > [a] > v a
 convert :: (Vector v a, Vector w a) => v a > w a
 freeze :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > m (v a)
 thaw :: (PrimMonad m, Vector v a) => v a > m (Mutable v (PrimState m) a)
 copy :: (HasCallStack, PrimMonad m, Vector v a) => Mutable v (PrimState m) a > v a > m ()
 unsafeFreeze :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > m (v a)
 unsafeThaw :: (PrimMonad m, Vector v a) => v a > m (Mutable v (PrimState m) a)
 unsafeCopy :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > v a > m ()
 stream :: Vector v a => v a > Bundle v a
 unstream :: Vector v a => Bundle v a > v a
 unstreamM :: (Monad m, Vector v a) => MBundle m u a > m (v a)
 streamR :: Vector v a => v a > Bundle u a
 unstreamR :: Vector v a => Bundle v a > v a
 new :: Vector v a => New v a > v a
 clone :: Vector v a => v a > New v a
 eq :: (Vector v a, Eq a) => v a > v a > Bool
 cmp :: (Vector v a, Ord a) => v a > v a > Ordering
 eqBy :: (Vector v a, Vector v b) => (a > b > Bool) > v a > v b > Bool
 cmpBy :: (Vector v a, Vector v b) => (a > b > Ordering) > v a > v b > Ordering
 showsPrec :: (Vector v a, Show a) => Int > v a > ShowS
 readPrec :: (Vector v a, Read a) => ReadPrec (v a)
 liftShowsPrec :: Vector v a => (Int > a > ShowS) > ([a] > ShowS) > Int > v a > ShowS
 liftReadsPrec :: Vector v a => (Int > ReadS a) > ReadS [a] > Int > ReadS (v a)
 gfoldl :: (Vector v a, Data a) => (forall d b. Data d => c (d > b) > d > c b) > (forall g. g > c g) > v a > c (v a)
 gunfold :: (Vector v a, Data a, HasCallStack) => (forall b r. Data b => c (b > r) > c r) > (forall r. r > c r) > Constr > c (v a)
 dataCast :: (Vector v a, Data a, Typeable v, Typeable t) => (forall d. Data d => c (t d)) > Maybe (c (v a))
 mkVecType :: String > DataType
 mkVecConstr :: String > Constr
 mkType :: String > DataType
Immutable vectors
class MVector (Mutable v) a => Vector v a where Source #
Class of immutable vectors. Every immutable vector is associated with its
mutable version through the Mutable
type family. Methods of this class
should not be used directly. Instead, Data.Vector.Generic and other
Data.Vector
modules provide safe and fusible wrappers.
Minimum complete implementation:
basicUnsafeFreeze :: Mutable v s a > ST s (v a) Source #
Assumed complexity: O(1)
Unsafely convert a mutable vector to its immutable version without copying. The mutable vector may not be used after this operation.
basicUnsafeThaw :: v a > ST s (Mutable v s a) Source #
Assumed complexity: O(1)
Unsafely convert an immutable vector to its mutable version without copying. The immutable vector may not be used after this operation.
basicLength :: v a > Int Source #
Assumed complexity: O(1)
Yield the length of the vector.
Assumed complexity: O(1)
Yield a slice of the vector without copying it. No range checks are performed.
basicUnsafeIndexM :: v a > Int > Box a Source #
Assumed complexity: O(1)
Yield the element at the given position in a monad. No range checks are performed.
The monad allows us to be strict in the vector if we want. Suppose we had
unsafeIndex :: v a > Int > a
instead. Now, if we wanted to copy a vector, we'd do something like
copy mv v ... = ... unsafeWrite mv i (unsafeIndex v i) ...
For lazy vectors, the indexing would not be evaluated, which means that we would retain a reference to the original vector in each element we write. This is not what we want!
With basicUnsafeIndexM
, we can do
copy mv v ... = ... case basicUnsafeIndexM v i of Box x > unsafeWrite mv i x ...
which does not have this problem, because indexing (but not the returned element!) is evaluated immediately.
basicUnsafeCopy :: Mutable v s a > v a > ST s () Source #
Assumed complexity: O(n)
Copy an immutable vector into a mutable one. The two vectors must have the same length, but this is not checked.
Instances of Vector
should redefine this method if they wish to support
an efficient block copy operation.
Default definition: copying based on basicUnsafeIndexM
and
basicUnsafeWrite
.
elemseq :: v a > a > b > b Source #
Evaluate a
as far as storing it in a vector would and yield b
.
The v a
argument only fixes the type and is not touched. This method is
only used for optimisation purposes. Thus, it is safe for instances of
Vector
to evaluate a
less than it would be when stored in a vector,
although this might result in suboptimal code.
elemseq v x y = (singleton x `asTypeOf` v) `seq` y
Default defintion: a
is not evaluated at all.
Instances
type family Mutable (v :: Type > Type) = (mv :: Type > Type > Type)  mv > v Source #
Mutable v s a
is the mutable version of the immutable vector type v a
with
the state token s
. It is injective on GHC 8 and newer.
Instances
type Mutable Vector Source #  
Defined in Data.Vector  
type Mutable Vector Source #  
Defined in Data.Vector.Primitive  
type Mutable Vector Source #  
Defined in Data.Vector.Storable  
type Mutable Vector Source #  
Defined in Data.Vector.Unboxed.Base 
Accessors
Length information
Indexing
unsafeIndex :: Vector v a => v a > Int > a Source #
O(1) Unsafe indexing without bounds checking.
unsafeHead :: Vector v a => v a > a Source #
O(1) First element, without checking if the vector is empty.
unsafeLast :: Vector v a => v a > a Source #
O(1) Last element, without checking if the vector is empty.
Monadic indexing
indexM :: (HasCallStack, Vector v a, Monad m) => v a > Int > m a Source #
O(1) Indexing in a monad.
The monad allows operations to be strict in the vector when necessary. Suppose vector copying is implemented like this:
copy mv v = ... write mv i (v ! i) ...
For lazy vectors, v ! i
would not be evaluated which means that mv
would unnecessarily retain a reference to v
in each element written.
With indexM
, copying can be implemented like this instead:
copy mv v = ... do x < indexM v i write mv i x
Here, no references to v
are retained because indexing (but not the
element) is evaluated eagerly.
headM :: (Vector v a, Monad m) => v a > m a Source #
O(1) First element of a vector in a monad. See indexM
for an
explanation of why this is useful.
lastM :: (Vector v a, Monad m) => v a > m a Source #
O(1) Last element of a vector in a monad. See indexM
for an
explanation of why this is useful.
unsafeIndexM :: (Vector v a, Monad m) => v a > Int > m a Source #
O(1) Indexing in a monad, without bounds checks. See indexM
for an
explanation of why this is useful.
unsafeHeadM :: (Vector v a, Monad m) => v a > m a Source #
O(1) First element in a monad, without checking for empty vectors.
See indexM
for an explanation of why this is useful.
unsafeLastM :: (Vector v a, Monad m) => v a > m a Source #
O(1) Last element in a monad, without checking for empty vectors.
See indexM
for an explanation of why this is useful.
Extracting subvectors (slicing)
:: (HasCallStack, Vector v a)  
=> Int 

> Int 

> v a  
> v a 
O(1) Yield a slice of the vector without copying it. The vector must
contain at least i+n
elements.
init :: Vector v a => v a > v a Source #
O(1) Yield all but the last element without copying. The vector may not be empty.
tail :: Vector v a => v a > v a Source #
O(1) Yield all but the first element without copying. The vector may not be empty.
take :: Vector v a => Int > v a > v a Source #
O(1) Yield the first n
elements without copying. The vector may
contain less than n
elements, in which case it is returned unchanged.
drop :: Vector v a => Int > v a > v a Source #
O(1) Yield all but the first n
elements without copying. The vector may
contain less than n
elements, in which case an empty vector is returned.
O(1) Yield a slice of the vector without copying. The vector must
contain at least i+n
elements, but this is not checked.
unsafeInit :: Vector v a => v a > v a Source #
O(1) Yield all but the last element without copying. The vector may not be empty, but this is not checked.
unsafeTail :: Vector v a => v a > v a Source #
O(1) Yield all but the first element without copying. The vector may not be empty, but this is not checked.
unsafeTake :: Vector v a => Int > v a > v a Source #
O(1) Yield the first n
elements without copying. The vector must
contain at least n
elements, but this is not checked.
unsafeDrop :: Vector v a => Int > v a > v a Source #
O(1) Yield all but the first n
elements without copying. The vector
must contain at least n
elements, but this is not checked.
Construction
Initialisation
replicate :: forall v a. Vector v a => Int > a > v a Source #
O(n) A vector of the given length with the same value in each position.
generate :: Vector v a => Int > (Int > a) > v a Source #
O(n) Construct a vector of the given length by applying the function to each index.
iterateN :: Vector v a => Int > (a > a) > a > v a Source #
O(n) Apply the function \(\max(n  1, 0)\) times to an initial value, producing a vector of length \(\max(n, 0)\). The 0th element will contain the initial value, which is why there is one less function application than the number of elements in the produced vector.
\( \underbrace{x, f (x), f (f (x)), \ldots}_{\max(0,n)\rm{~elements}} \)
Since: 0.7.1
Monadic initialisation
replicateM :: (Monad m, Vector v a) => Int > m a > m (v a) Source #
O(n) Execute the monadic action the given number of times and store the results in a vector.
generateM :: (Monad m, Vector v a) => Int > (Int > m a) > m (v a) Source #
O(n) Construct a vector of the given length by applying the monadic action to each index.
iterateNM :: (Monad m, Vector v a) => Int > (a > m a) > a > m (v a) Source #
O(n) Apply the monadic function \(\max(n  1, 0)\) times to an initial value, producing a vector of length \(\max(n, 0)\). The 0th element will contain the initial value, which is why there is one less function application than the number of elements in the produced vector.
For a nonmonadic version, see iterateN
.
Since: 0.12.0.0
createT :: (Traversable f, Vector v a) => (forall s. ST s (f (Mutable v s a))) > f (v a) Source #
Execute the monadic action and freeze the resulting vectors.
Unfolding
unfoldrExactN :: Vector v a => Int > (b > (a, b)) > b > v a Source #
O(n) Construct a vector with exactly n
elements by repeatedly applying
the generator function to a seed. The generator function yields the
next element and the new seed.
unfoldrExactN 3 (\n > (n,n1)) 10 = <10,9,8>
Since: 0.12.2.0
unfoldrExactNM :: (Monad m, Vector v a) => Int > (b > m (a, b)) > b > m (v a) Source #
O(n) Construct a vector with exactly n
elements by repeatedly
applying the monadic generator function to a seed. The generator
function yields the next element and the new seed.
Since: 0.12.2.0
constructN :: forall v a. Vector v a => Int > (v a > a) > v a Source #
O(n) Construct a vector with n
elements by repeatedly applying the
generator function to the already constructed part of the vector.
constructN 3 f = let a = f <> ; b = f <a> ; c = f <a,b> in <a,b,c>
constructrN :: forall v a. Vector v a => Int > (v a > a) > v a Source #
O(n) Construct a vector with n
elements from right to left by
repeatedly applying the generator function to the already constructed part
of the vector.
constructrN 3 f = let a = f <> ; b = f<a> ; c = f <b,a> in <c,b,a>
Enumeration
enumFromN :: (Vector v a, Num a) => a > Int > v a Source #
O(n) Yield a vector of the given length, containing the values x
, x+1
etc. This operation is usually more efficient than enumFromTo
.
enumFromN 5 3 = <5,6,7>
enumFromStepN :: forall v a. (Vector v a, Num a) => a > a > Int > v a Source #
O(n) Yield a vector of the given length, containing the values x
, x+y
,
x+y+y
etc. This operations is usually more efficient than enumFromThenTo
.
enumFromStepN 1 2 5 = <1,3,5,7,9>
enumFromTo :: (Vector v a, Enum a) => a > a > v a Source #
O(n) Enumerate values from x
to y
.
WARNING: This operation can be very inefficient. If possible, use
enumFromN
instead.
enumFromThenTo :: (Vector v a, Enum a) => a > a > a > v a Source #
O(n) Enumerate values from x
to y
with a specific step z
.
WARNING: This operation can be very inefficient. If possible, use
enumFromStepN
instead.
Concatenation
concatNE :: Vector v a => NonEmpty (v a) > v a Source #
O(n) Concatenate all vectors in the nonempty list.
Restricting memory usage
force :: Vector v a => v a > v a Source #
O(n) Yield the argument, but force it not to retain any extra memory, possibly by copying it.
This is especially useful when dealing with slices. For example:
force (slice 0 2 <huge vector>)
Here, the slice retains a reference to the huge vector. Forcing it creates a copy of just the elements that belong to the slice and allows the huge vector to be garbage collected.
Modifying vectors
Bulk updates
:: Vector v a  
=> v a  initial vector (of length 
> [(Int, a)]  list of index/value pairs (of length 
> v a 
O(m+n) For each pair (i,a)
from the list of index/value pairs,
replace the vector element at position i
by a
.
<5,9,2,7> // [(2,1),(0,3),(2,8)] = <3,9,8,7>
:: (Vector v a, Vector v (Int, a))  
=> v a  initial vector (of length 
> v (Int, a)  vector of index/value pairs (of length 
> v a 
O(m+n) For each pair (i,a)
from the vector of index/value pairs,
replace the vector element at position i
by a
.
update <5,9,2,7> <(2,1),(0,3),(2,8)> = <3,9,8,7>
:: (Vector v a, Vector v Int)  
=> v a  initial vector (of length 
> v Int  index vector (of length 
> v a  value vector (of length 
> v a 
O(m+min(n1,n2)) For each index i
from the index vector and the
corresponding value a
from the value vector, replace the element of the
initial vector at position i
by a
.
update_ <5,9,2,7> <2,0,2> <1,3,8> = <3,9,8,7>
This function is useful for instances of Vector
that cannot store pairs.
Otherwise, update
is probably more convenient.
update_ xs is ys =update
xs (zip
is ys)
unsafeUpd :: Vector v a => v a > [(Int, a)] > v a Source #
Same as (//
), but without bounds checking.
unsafeUpdate :: (Vector v a, Vector v (Int, a)) => v a > v (Int, a) > v a Source #
Same as update
, but without bounds checking.
unsafeUpdate_ :: (Vector v a, Vector v Int) => v a > v Int > v a > v a Source #
Same as update_
, but without bounds checking.
Accumulations
:: Vector v a  
=> (a > b > a)  accumulating function 
> v a  initial vector (of length 
> [(Int, b)]  list of index/value pairs (of length 
> v a 
O(m+n) For each pair (i,b)
from the list, replace the vector element
a
at position i
by f a b
.
Examples
>>>
import qualified Data.Vector as V
>>>
V.accum (+) (V.fromList [1000,2000,3000]) [(2,4),(1,6),(0,3),(1,10)]
[1003,2016,3004]
:: (Vector v a, Vector v (Int, b))  
=> (a > b > a)  accumulating function 
> v a  initial vector (of length 
> v (Int, b)  vector of index/value pairs (of length 
> v a 
O(m+n) For each pair (i,b)
from the vector of pairs, replace the vector
element a
at position i
by f a b
.
Examples
>>>
import qualified Data.Vector as V
>>>
V.accumulate (+) (V.fromList [1000,2000,3000]) (V.fromList [(2,4),(1,6),(0,3),(1,10)])
[1003,2016,3004]
:: (Vector v a, Vector v Int, Vector v b)  
=> (a > b > a)  accumulating function 
> v a  initial vector (of length 
> v Int  index vector (of length 
> v b  value vector (of length 
> v a 
O(m+min(n1,n2)) For each index i
from the index vector and the
corresponding value b
from the the value vector,
replace the element of the initial vector at
position i
by f a b
.
accumulate_ (+) <5,9,2> <2,1,0,1> <4,6,3,7> = <5+3, 9+6+7, 2+4>
This function is useful for instances of Vector
that cannot store pairs.
Otherwise, accumulate
is probably more convenient:
accumulate_ f as is bs =accumulate
f as (zip
is bs)
unsafeAccum :: Vector v a => (a > b > a) > v a > [(Int, b)] > v a Source #
Same as accum
, but without bounds checking.
unsafeAccumulate :: (Vector v a, Vector v (Int, b)) => (a > b > a) > v a > v (Int, b) > v a Source #
Same as accumulate
, but without bounds checking.
unsafeAccumulate_ :: (Vector v a, Vector v Int, Vector v b) => (a > b > a) > v a > v Int > v b > v a Source #
Same as accumulate_
, but without bounds checking.
Permutations
:: forall v a. (HasCallStack, Vector v a, Vector v Int)  
=> v a 

> v Int 

> v a 
unsafeBackpermute :: (Vector v a, Vector v Int) => v a > v Int > v a Source #
Same as backpermute
, but without bounds checking.
Safe destructive updates
Elementwise operations
Indexing
indexed :: (Vector v a, Vector v (Int, a)) => v a > v (Int, a) Source #
O(n) Pair each element in a vector with its index.
Mapping
map :: (Vector v a, Vector v b) => (a > b) > v a > v b Source #
O(n) Map a function over a vector.
imap :: (Vector v a, Vector v b) => (Int > a > b) > v a > v b Source #
O(n) Apply a function to every element of a vector and its index.
concatMap :: (Vector v a, Vector v b) => (a > v b) > v a > v b Source #
Map a function over a vector and concatenate the results.
Monadic mapping
mapM :: (Monad m, Vector v a, Vector v b) => (a > m b) > v a > m (v b) Source #
O(n) Apply the monadic action to all elements of the vector, yielding a vector of results.
imapM :: (Monad m, Vector v a, Vector v b) => (Int > a > m b) > v a > m (v b) Source #
O(n) Apply the monadic action to every element of a vector and its index, yielding a vector of results.
mapM_ :: (Monad m, Vector v a) => (a > m b) > v a > m () Source #
O(n) Apply the monadic action to all elements of a vector and ignore the results.
imapM_ :: (Monad m, Vector v a) => (Int > a > m b) > v a > m () Source #
O(n) Apply the monadic action to every element of a vector and its index, ignoring the results.
forM :: (Monad m, Vector v a, Vector v b) => v a > (a > m b) > m (v b) Source #
O(n) Apply the monadic action to all elements of the vector, yielding a
vector of results. Equivalent to flip
.mapM
forM_ :: (Monad m, Vector v a) => v a > (a > m b) > m () Source #
O(n) Apply the monadic action to all elements of a vector and ignore the
results. Equivalent to flip
.mapM_
Zipping
zipWith :: (Vector v a, Vector v b, Vector v c) => (a > b > c) > v a > v b > v c Source #
O(min(m,n)) Zip two vectors with the given function.
zipWith3 :: (Vector v a, Vector v b, Vector v c, Vector v d) => (a > b > c > d) > v a > v b > v c > v d Source #
Zip three vectors with the given function.
zipWith4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e) => (a > b > c > d > e) > v a > v b > v c > v d > v e Source #
zipWith5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f) => (a > b > c > d > e > f) > v a > v b > v c > v d > v e > v f Source #
zipWith6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v g) => (a > b > c > d > e > f > g) > v a > v b > v c > v d > v e > v f > v g Source #
izipWith :: (Vector v a, Vector v b, Vector v c) => (Int > a > b > c) > v a > v b > v c Source #
O(min(m,n)) Zip two vectors with a function that also takes the elements' indices.
izipWith3 :: (Vector v a, Vector v b, Vector v c, Vector v d) => (Int > a > b > c > d) > v a > v b > v c > v d Source #
Zip three vectors and their indices with the given function.
izipWith4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e) => (Int > a > b > c > d > e) > v a > v b > v c > v d > v e Source #
izipWith5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f) => (Int > a > b > c > d > e > f) > v a > v b > v c > v d > v e > v f Source #
izipWith6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v g) => (Int > a > b > c > d > e > f > g) > v a > v b > v c > v d > v e > v f > v g Source #
zip :: (Vector v a, Vector v b, Vector v (a, b)) => v a > v b > v (a, b) Source #
O(min(m,n)) Zip two vectors.
zip3 :: (Vector v a, Vector v b, Vector v c, Vector v (a, b, c)) => v a > v b > v c > v (a, b, c) Source #
Zip together three vectors into a vector of triples.
zip4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v (a, b, c, d)) => v a > v b > v c > v d > v (a, b, c, d) Source #
zip5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v (a, b, c, d, e)) => v a > v b > v c > v d > v e > v (a, b, c, d, e) Source #
zip6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v (a, b, c, d, e, f)) => v a > v b > v c > v d > v e > v f > v (a, b, c, d, e, f) Source #
Monadic zipping
zipWithM :: (Monad m, Vector v a, Vector v b, Vector v c) => (a > b > m c) > v a > v b > m (v c) Source #
O(min(m,n)) Zip the two vectors with the monadic action and yield a vector of results.
izipWithM :: (Monad m, Vector v a, Vector v b, Vector v c) => (Int > a > b > m c) > v a > v b > m (v c) Source #
O(min(m,n)) Zip the two vectors with a monadic action that also takes the element index and yield a vector of results.
zipWithM_ :: (Monad m, Vector v a, Vector v b) => (a > b > m c) > v a > v b > m () Source #
O(min(m,n)) Zip the two vectors with the monadic action and ignore the results.
izipWithM_ :: (Monad m, Vector v a, Vector v b) => (Int > a > b > m c) > v a > v b > m () Source #
O(min(m,n)) Zip the two vectors with a monadic action that also takes the element index and ignore the results.
Unzipping
unzip :: (Vector v a, Vector v b, Vector v (a, b)) => v (a, b) > (v a, v b) Source #
O(min(m,n)) Unzip a vector of pairs.
unzip3 :: (Vector v a, Vector v b, Vector v c, Vector v (a, b, c)) => v (a, b, c) > (v a, v b, v c) Source #
unzip4 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v (a, b, c, d)) => v (a, b, c, d) > (v a, v b, v c, v d) Source #
unzip5 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v (a, b, c, d, e)) => v (a, b, c, d, e) > (v a, v b, v c, v d, v e) Source #
unzip6 :: (Vector v a, Vector v b, Vector v c, Vector v d, Vector v e, Vector v f, Vector v (a, b, c, d, e, f)) => v (a, b, c, d, e, f) > (v a, v b, v c, v d, v e, v f) Source #
Working with predicates
Filtering
filter :: Vector v a => (a > Bool) > v a > v a Source #
O(n) Drop all elements that do not satisfy the predicate.
ifilter :: Vector v a => (Int > a > Bool) > v a > v a Source #
O(n) Drop all elements that do not satisfy the predicate which is applied to the values and their indices.
filterM :: (Monad m, Vector v a) => (a > m Bool) > v a > m (v a) Source #
O(n) Drop all elements that do not satisfy the monadic predicate.
uniq :: (Vector v a, Eq a) => v a > v a Source #
O(n) Drop repeated adjacent elements. The first element in each group is returned.
Examples
>>>
import qualified Data.Vector as V
>>>
V.uniq $ V.fromList [1,3,3,200,3]
[1,3,200,3]>>>
import Data.Semigroup
>>>
V.uniq $ V.fromList [ Arg 1 'a', Arg 1 'b', Arg 1 'c']
[Arg 1 'a']
mapMaybe :: (Vector v a, Vector v b) => (a > Maybe b) > v a > v b Source #
O(n) Map the values and collect the Just
results.
imapMaybe :: (Vector v a, Vector v b) => (Int > a > Maybe b) > v a > v b Source #
O(n) Map the indices/values and collect the Just
results.
mapMaybeM :: (Monad m, Vector v a, Vector v b) => (a > m (Maybe b)) > v a > m (v b) Source #
O(n) Apply the monadic function to each element of the vector and
discard elements returning Nothing
.
Since: 0.12.2.0
imapMaybeM :: (Monad m, Vector v a, Vector v b) => (Int > a > m (Maybe b)) > v a > m (v b) Source #
O(n) Apply the monadic function to each element of the vector and its index.
Discard elements returning Nothing
.
Since: 0.12.2.0
takeWhile :: Vector v a => (a > Bool) > v a > v a Source #
O(n) Yield the longest prefix of elements satisfying the predicate. The current implementation is not copyfree, unless the result vector is fused away.
dropWhile :: Vector v a => (a > Bool) > v a > v a Source #
O(n) Drop the longest prefix of elements that satisfy the predicate without copying.
Partitioning
partition :: Vector v a => (a > Bool) > v a > (v a, v a) Source #
O(n) Split the vector in two parts, the first one containing those
elements that satisfy the predicate and the second one those that don't. The
relative order of the elements is preserved at the cost of a sometimes
reduced performance compared to unstablePartition
.
partitionWith :: (Vector v a, Vector v b, Vector v c) => (a > Either b c) > v a > (v b, v c) Source #
unstablePartition :: Vector v a => (a > Bool) > v a > (v a, v a) Source #
O(n) Split the vector in two parts, the first one containing those
elements that satisfy the predicate and the second one those that don't.
The order of the elements is not preserved, but the operation is often
faster than partition
.
span :: Vector v a => (a > Bool) > v a > (v a, v a) Source #
O(n) Split the vector into the longest prefix of elements that satisfy the predicate and the rest without copying.
break :: Vector v a => (a > Bool) > v a > (v a, v a) Source #
O(n) Split the vector into the longest prefix of elements that do not satisfy the predicate and the rest without copying.
groupBy :: Vector v a => (a > a > Bool) > v a > [v a] Source #
O(n) Split a vector into a list of slices.
The concatenation of this list of slices is equal to the argument vector, and each slice contains only equal elements, as determined by the equality predicate function.
>>>
import qualified Data.Vector as V
>>>
import Data.Char (isUpper)
>>>
V.groupBy (\a b > isUpper a == isUpper b) (V.fromList "Mississippi River")
["M","ississippi ","R","iver"]
See also groupBy
.
Since: 0.13.0.1
group :: (Vector v a, Eq a) => v a > [v a] Source #
O(n) Split a vector into a list of slices.
The concatenation of this list of slices is equal to the argument vector, and each slice contains only equal elements.
This is the equivalent of 'groupBy (==)'.
>>>
import qualified Data.Vector as V
>>>
V.group (V.fromList "Mississippi")
["M","i","ss","i","ss","i","pp","i"]
See also group
.
Since: 0.13.0.1
Searching
elem :: (Vector v a, Eq a) => a > v a > Bool infix 4 Source #
O(n) Check if the vector contains an element.
notElem :: (Vector v a, Eq a) => a > v a > Bool infix 4 Source #
O(n) Check if the vector does not contain an element (inverse of elem
).
findIndices :: (Vector v a, Vector v Int) => (a > Bool) > v a > v Int Source #
O(n) Yield the indices of elements satisfying the predicate in ascending order.
elemIndices :: (Vector v a, Vector v Int, Eq a) => a > v a > v Int Source #
O(n) Yield the indices of all occurrences of the given element in
ascending order. This is a specialised version of findIndices
.
Folding
foldl' :: Vector v b => (a > b > a) > a > v b > a Source #
O(n) Left fold with strict accumulator.
foldl1' :: Vector v a => (a > a > a) > v a > a Source #
O(n) Left fold on nonempty vectors with strict accumulator.
foldr' :: Vector v a => (a > b > b) > b > v a > b Source #
O(n) Right fold with a strict accumulator.
foldr1' :: Vector v a => (a > a > a) > v a > a Source #
O(n) Right fold on nonempty vectors with strict accumulator.
ifoldl :: Vector v b => (a > Int > b > a) > a > v b > a Source #
O(n) Left fold using a function applied to each element and its index.
ifoldl' :: Vector v b => (a > Int > b > a) > a > v b > a Source #
O(n) Left fold with strict accumulator using a function applied to each element and its index.
ifoldr :: Vector v a => (Int > a > b > b) > b > v a > b Source #
O(n) Right fold using a function applied to each element and its index.
ifoldr' :: Vector v a => (Int > a > b > b) > b > v a > b Source #
O(n) Right fold with strict accumulator using a function applied to each element and its index.
foldMap :: (Monoid m, Vector v a) => (a > m) > v a > m Source #
O(n) Map each element of the structure to a monoid and combine
the results. It uses the same implementation as the corresponding method
of the Foldable
type cless. Note that it's implemented in terms of foldr
and won't fuse with functions that traverse the vector from left to
right (map
, generate
, etc.).
Since: 0.12.2.0
Specialised folds
all :: Vector v a => (a > Bool) > v a > Bool Source #
O(n) Check if all elements satisfy the predicate.
Examples
>>>
import qualified Data.Vector as V
>>>
V.all even $ V.fromList [2, 4, 12]
True>>>
V.all even $ V.fromList [2, 4, 13]
False>>>
V.all even (V.empty :: V.Vector Int)
True
any :: Vector v a => (a > Bool) > v a > Bool Source #
O(n) Check if any element satisfies the predicate.
Examples
>>>
import qualified Data.Vector as V
>>>
V.any even $ V.fromList [1, 3, 7]
False>>>
V.any even $ V.fromList [3, 2, 13]
True>>>
V.any even (V.empty :: V.Vector Int)
False
and :: Vector v Bool => v Bool > Bool Source #
O(n) Check if all elements are True
.
Examples
>>>
import qualified Data.Vector as V
>>>
V.and $ V.fromList [True, False]
False>>>
V.and V.empty
True
or :: Vector v Bool => v Bool > Bool Source #
O(n) Check if any element is True
.
Examples
>>>
import qualified Data.Vector as V
>>>
V.or $ V.fromList [True, False]
True>>>
V.or V.empty
False
sum :: (Vector v a, Num a) => v a > a Source #
O(n) Compute the sum of the elements.
Examples
>>>
import qualified Data.Vector as V
>>>
V.sum $ V.fromList [300,20,1]
321>>>
V.sum (V.empty :: V.Vector Int)
0
product :: (Vector v a, Num a) => v a > a Source #
O(n) Compute the product of the elements.
Examples
>>>
import qualified Data.Vector as V
>>>
V.product $ V.fromList [1,2,3,4]
24>>>
V.product (V.empty :: V.Vector Int)
1
maximum :: (Vector v a, Ord a) => v a > a Source #
O(n) Yield the maximum element of the vector. The vector may not be empty. In case of a tie, the first occurrence wins.
Examples
>>>
import qualified Data.Vector as V
>>>
V.maximum $ V.fromList [2, 1]
2>>>
import Data.Semigroup
>>>
V.maximum $ V.fromList [Arg 1 'a', Arg 2 'b']
Arg 2 'b'>>>
V.maximum $ V.fromList [Arg 1 'a', Arg 1 'b']
Arg 1 'a'
maximumBy :: Vector v a => (a > a > Ordering) > v a > a Source #
O(n) Yield the maximum element of the vector according to the
given comparison function. The vector may not be empty. In case of
a tie, the first occurrence wins. This behavior is different from
maximumBy
which returns the last tie.
Examples
>>>
import Data.Ord
>>>
import qualified Data.Vector as V
>>>
V.maximumBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
(2,'a')>>>
V.maximumBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
(1,'a')
maximumOn :: (Ord b, Vector v a) => (a > b) > v a > a Source #
O(n) Yield the maximum element of the vector by comparing the results of a key function on each element. In case of a tie, the first occurrence wins. The vector may not be empty.
Examples
>>>
import qualified Data.Vector as V
>>>
V.maximumOn fst $ V.fromList [(2,'a'), (1,'b')]
(2,'a')>>>
V.maximumOn fst $ V.fromList [(1,'a'), (1,'b')]
(1,'a')
Since: 0.13.0.0
minimum :: (Vector v a, Ord a) => v a > a Source #
O(n) Yield the minimum element of the vector. The vector may not be empty. In case of a tie, the first occurrence wins.
Examples
>>>
import qualified Data.Vector as V
>>>
V.minimum $ V.fromList [2, 1]
1>>>
import Data.Semigroup
>>>
V.minimum $ V.fromList [Arg 2 'a', Arg 1 'b']
Arg 1 'b'>>>
V.minimum $ V.fromList [Arg 1 'a', Arg 1 'b']
Arg 1 'a'
minimumBy :: Vector v a => (a > a > Ordering) > v a > a Source #
O(n) Yield the minimum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins.
Examples
>>>
import Data.Ord
>>>
import qualified Data.Vector as V
>>>
V.minimumBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
(1,'b')>>>
V.minimumBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
(1,'a')
minimumOn :: (Ord b, Vector v a) => (a > b) > v a > a Source #
O(n) Yield the minimum element of the vector by comparing the results of a key function on each element. In case of a tie, the first occurrence wins. The vector may not be empty.
Examples
>>>
import qualified Data.Vector as V
>>>
V.minimumOn fst $ V.fromList [(2,'a'), (1,'b')]
(1,'b')>>>
V.minimumOn fst $ V.fromList [(1,'a'), (1,'b')]
(1,'a')
Since: 0.13.0.0
minIndex :: (Vector v a, Ord a) => v a > Int Source #
O(n) Yield the index of the minimum element of the vector. The vector may not be empty.
minIndexBy :: Vector v a => (a > a > Ordering) > v a > Int Source #
O(n) Yield the index of the minimum element of the vector according to the given comparison function. The vector may not be empty.
Examples
>>>
import Data.Ord
>>>
import qualified Data.Vector as V
>>>
V.minIndexBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
1>>>
V.minIndexBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
0
maxIndex :: (Vector v a, Ord a) => v a > Int Source #
O(n) Yield the index of the maximum element of the vector. The vector may not be empty.
maxIndexBy :: Vector v a => (a > a > Ordering) > v a > Int Source #
O(n) Yield the index of the maximum element of the vector according to the given comparison function. The vector may not be empty. In case of a tie, the first occurrence wins.
Examples
>>>
import Data.Ord
>>>
import qualified Data.Vector as V
>>>
V.maxIndexBy (comparing fst) $ V.fromList [(2,'a'), (1,'b')]
0>>>
V.maxIndexBy (comparing fst) $ V.fromList [(1,'a'), (1,'b')]
0
Monadic folds
ifoldM :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m a Source #
O(n) Monadic fold using a function applied to each element and its index.
foldM' :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m a Source #
O(n) Monadic fold with strict accumulator.
ifoldM' :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m a Source #
O(n) Monadic fold with strict accumulator using a function applied to each element and its index.
fold1M :: (Monad m, Vector v a) => (a > a > m a) > v a > m a Source #
O(n) Monadic fold over nonempty vectors.
fold1M' :: (Monad m, Vector v a) => (a > a > m a) > v a > m a Source #
O(n) Monadic fold over nonempty vectors with strict accumulator.
foldM_ :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m () Source #
O(n) Monadic fold that discards the result.
ifoldM_ :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m () Source #
O(n) Monadic fold that discards the result using a function applied to each element and its index.
foldM'_ :: (Monad m, Vector v b) => (a > b > m a) > a > v b > m () Source #
O(n) Monadic fold with strict accumulator that discards the result.
ifoldM'_ :: (Monad m, Vector v b) => (a > Int > b > m a) > a > v b > m () Source #
O(n) Monadic fold with strict accumulator that discards the result using a function applied to each element and its index.
fold1M_ :: (Monad m, Vector v a) => (a > a > m a) > v a > m () Source #
O(n) Monadic fold over nonempty vectors that discards the result.
fold1M'_ :: (Monad m, Vector v a) => (a > a > m a) > v a > m () Source #
O(n) Monad fold over nonempty vectors with strict accumulator that discards the result.
Monadic sequencing
sequence :: (Monad m, Vector v a, Vector v (m a)) => v (m a) > m (v a) Source #
Evaluate each action and collect the results.
sequence_ :: (Monad m, Vector v (m a)) => v (m a) > m () Source #
Evaluate each action and discard the results.
Scans
prescanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a Source #
O(n) Lefttoright prescan with strict accumulator.
postscanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a Source #
O(n) Lefttoright postscan with strict accumulator.
scanl :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a Source #
O(n) Lefttoright scan.
scanl f z <x1,...,xn> = <y1,...,y(n+1)> where y1 = z yi = f y(i1) x(i1)
Examples
>>>
import qualified Data.Vector as V
>>>
V.scanl (+) 0 (V.fromList [1,2,3,4])
[0,1,3,6,10]
scanl' :: (Vector v a, Vector v b) => (a > b > a) > a > v b > v a Source #
O(n) Lefttoright scan with strict accumulator.
scanl1 :: Vector v a => (a > a > a) > v a > v a Source #
O(n) Initialvalue free lefttoright scan over a vector.
scanl f <x1,...,xn> = <y1,...,yn> where y1 = x1 yi = f y(i1) xi
Note: Since 0.13, application of this to an empty vector no longer results in an error; instead it produces an empty vector.
Examples
>>>
import qualified Data.Vector as V
>>>
V.scanl1 min $ V.fromListN 5 [4,2,4,1,3]
[4,2,2,1,1]>>>
V.scanl1 max $ V.fromListN 5 [1,3,2,5,4]
[1,3,3,5,5]>>>
V.scanl1 min (V.empty :: V.Vector Int)
[]
scanl1' :: Vector v a => (a > a > a) > v a > v a Source #
O(n) Initialvalue free lefttoright scan over a vector with a strict accumulator.
Note: Since 0.13, application of this to an empty vector no longer results in an error; instead it produces an empty vector.
Examples
>>>
import qualified Data.Vector as V
>>>
V.scanl1' min $ V.fromListN 5 [4,2,4,1,3]
[4,2,2,1,1]>>>
V.scanl1' max $ V.fromListN 5 [1,3,2,5,4]
[1,3,3,5,5]>>>
V.scanl1' min (V.empty :: V.Vector Int)
[]
iscanl :: (Vector v a, Vector v b) => (Int > a > b > a) > a > v b > v a Source #
O(n) Lefttoright scan over a vector with its index.
iscanl' :: (Vector v a, Vector v b) => (Int > a > b > a) > a > v b > v a Source #
O(n) Lefttoright scan over a vector (strictly) with its index.
prescanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b Source #
O(n) Righttoleft prescan with strict accumulator.
postscanr :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b Source #
O(n) Righttoleft postscan.
postscanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b Source #
O(n) Righttoleft postscan with strict accumulator.
scanr :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b Source #
O(n) Righttoleft scan.
scanr' :: (Vector v a, Vector v b) => (a > b > b) > b > v a > v b Source #
O(n) Righttoleft scan with strict accumulator.
scanr1 :: Vector v a => (a > a > a) > v a > v a Source #
O(n) Righttoleft, initialvalue free scan over a vector.
Note: Since 0.13, application of this to an empty vector no longer results in an error; instead it produces an empty vector.
Examples
>>>
import qualified Data.Vector as V
>>>
V.scanr1 min $ V.fromListN 5 [3,1,4,2,4]
[1,1,2,2,4]>>>
V.scanr1 max $ V.fromListN 5 [4,5,2,3,1]
[5,5,3,3,1]>>>
V.scanr1 min (V.empty :: V.Vector Int)
[]
scanr1' :: Vector v a => (a > a > a) > v a > v a Source #
O(n) Righttoleft, initialvalue free scan over a vector with a strict accumulator.
Note: Since 0.13, application of this to an empty vector no longer results in an error; instead it produces an empty vector.
Examples
>>>
import qualified Data.Vector as V
>>>
V.scanr1' min $ V.fromListN 5 [3,1,4,2,4]
[1,1,2,2,4]>>>
V.scanr1' max $ V.fromListN 5 [4,5,2,3,1]
[5,5,3,3,1]>>>
V.scanr1' min (V.empty :: V.Vector Int)
[]
iscanr :: (Vector v a, Vector v b) => (Int > a > b > b) > b > v a > v b Source #
O(n) Righttoleft scan over a vector with its index.
iscanr' :: (Vector v a, Vector v b) => (Int > a > b > b) > b > v a > v b Source #
O(n) Righttoleft scan over a vector (strictly) with its index.
Conversions
Lists
fromListN :: Vector v a => Int > [a] > v a Source #
O(n) Convert the first n
elements of a list to a vector. It's
expected that the supplied list will be exactly n
elements long. As
an optimization, this function allocates a buffer for n
elements, which
could be used for DoSattacks by exhausting the memory if an attacker controls
that parameter.
fromListN n xs =fromList
(take
n xs)
Examples
>>>
import qualified Data.Vector as V
>>>
V.fromListN 3 [1,2,3,4,5]
[1,2,3]>>>
V.fromListN 3 [1]
[1]
Different vector types
convert :: (Vector v a, Vector w a) => v a > w a Source #
O(n) Convert between different vector types.
Mutable vectors
freeze :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > m (v a) Source #
O(n) Yield an immutable copy of the mutable vector.
thaw :: (PrimMonad m, Vector v a) => v a > m (Mutable v (PrimState m) a) Source #
O(n) Yield a mutable copy of an immutable vector.
copy :: (HasCallStack, PrimMonad m, Vector v a) => Mutable v (PrimState m) a > v a > m () Source #
O(n) Copy an immutable vector into a mutable one. The two vectors must have the same length.
unsafeFreeze :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > m (v a) Source #
O(1) Unsafely convert a mutable vector to an immutable one without copying. The mutable vector may not be used after this operation.
unsafeThaw :: (PrimMonad m, Vector v a) => v a > m (Mutable v (PrimState m) a) Source #
O(1) Unsafely convert an immutable vector to a mutable one without copying. Note that this is a very dangerous function and generally it's only safe to read from the resulting vector. In this case, the immutable vector could be used safely as well.
Problems with mutation happen because GHC has a lot of freedom to
introduce sharing. As a result mutable vectors produced by
unsafeThaw
may or may not share the same underlying buffer. For
example:
foo = do let vec = V.generate 10 id mvec < V.unsafeThaw vec do_something mvec
Here GHC could lift vec
outside of foo which means that all calls to
do_something
will use same buffer with possibly disastrous
results. Whether such aliasing happens or not depends on the program in
question, optimization levels, and GHC flags.
All in all, attempts to modify a vector produced by unsafeThaw
fall out of
domain of software engineering and into realm of black magic, dark
rituals, and unspeakable horrors. The only advice that could be given
is: "Don't attempt to mutate a vector produced by unsafeThaw
unless you
know how to prevent GHC from aliasing buffers accidentally. We don't."
unsafeCopy :: (PrimMonad m, Vector v a) => Mutable v (PrimState m) a > v a > m () Source #
O(n) Copy an immutable vector into a mutable one. The two vectors must have the same length. This is not checked.
Fusion support
Conversion to/from Bundles
unstreamM :: (Monad m, Vector v a) => MBundle m u a > m (v a) Source #
Load a monadic stream bundle into a newly allocated vector. This function goes through
a list, so prefer using unstream
, unless you need to be in a monad.
Since: 0.12.2.0
streamR :: Vector v a => v a > Bundle u a Source #
O(1) Convert a vector to a Bundle
, proceeding from right to left.
unstreamR :: Vector v a => Bundle v a > v a Source #
O(n) Construct a vector from a Bundle
, proceeding from right to left.
Recycling support
clone :: Vector v a => v a > New v a Source #
Convert a vector to an initialiser which, when run, produces a copy of the vector.
Utilities
Comparisons
eqBy :: (Vector v a, Vector v b) => (a > b > Bool) > v a > v b > Bool Source #
O(n) Check if two vectors are equal using the supplied equality predicate.
cmpBy :: (Vector v a, Vector v b) => (a > b > Ordering) > v a > v b > Ordering Source #
O(n) Compare two vectors using the supplied comparison function for vector elements. Comparison works the same as for lists.
cmpBy compare == cmp
Show and Read
liftShowsPrec :: Vector v a => (Int > a > ShowS) > ([a] > ShowS) > Int > v a > ShowS Source #
liftReadsPrec :: Vector v a => (Int > ReadS a) > ReadS [a] > Int > ReadS (v a) Source #
Note: uses ReadS
.
Data
and Typeable
gfoldl :: (Vector v a, Data a) => (forall d b. Data d => c (d > b) > d > c b) > (forall g. g > c g) > v a > c (v a) Source #
gunfold :: (Vector v a, Data a, HasCallStack) => (forall b r. Data b => c (b > r) > c r) > (forall r. r > c r) > Constr > c (v a) Source #
dataCast :: (Vector v a, Data a, Typeable v, Typeable t) => (forall d. Data d => c (t d)) > Maybe (c (v a)) Source #
mkVecConstr :: String > Constr Source #