vector-0.12.3.1: Efficient Arrays
Copyright(c) Roman Leshchinskiy 2009-2010
LicenseBSD-style
MaintainerRoman Leshchinskiy <rl@cse.unsw.edu.au>
Stabilityexperimental
Portabilitynon-portable
Safe HaskellNone
LanguageHaskell2010

Data.Vector.Storable

Description

Storable-based vectors.

Synopsis

Storable vectors

data Vector a Source #

Storable-based vectors

Instances

Instances details
NFData1 Vector Source #

Since: 0.12.1.0

Instance details

Defined in Data.Vector.Storable

Methods

liftRnf :: (a -> ()) -> Vector a -> () Source #

Storable a => Vector Vector a Source # 
Instance details

Defined in Data.Vector.Storable

Storable a => IsList (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Associated Types

type Item (Vector a) Source #

Methods

fromList :: [Item (Vector a)] -> Vector a Source #

fromListN :: Int -> [Item (Vector a)] -> Vector a Source #

toList :: Vector a -> [Item (Vector a)] Source #

(Storable a, Eq a) => Eq (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Methods

(==) :: Vector a -> Vector a -> Bool Source #

(/=) :: Vector a -> Vector a -> Bool Source #

(Data a, Storable a) => Data (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Vector a -> c (Vector a) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Vector a) Source #

toConstr :: Vector a -> Constr Source #

dataTypeOf :: Vector a -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Vector a)) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Vector a)) Source #

gmapT :: (forall b. Data b => b -> b) -> Vector a -> Vector a Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Vector a -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Vector a -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Vector a -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Vector a -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Vector a -> m (Vector a) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Vector a -> m (Vector a) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Vector a -> m (Vector a) Source #

(Storable a, Ord a) => Ord (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Methods

compare :: Vector a -> Vector a -> Ordering Source #

(<) :: Vector a -> Vector a -> Bool Source #

(<=) :: Vector a -> Vector a -> Bool Source #

(>) :: Vector a -> Vector a -> Bool Source #

(>=) :: Vector a -> Vector a -> Bool Source #

max :: Vector a -> Vector a -> Vector a Source #

min :: Vector a -> Vector a -> Vector a Source #

(Read a, Storable a) => Read (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

(Show a, Storable a) => Show (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Storable a => Semigroup (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Methods

(<>) :: Vector a -> Vector a -> Vector a Source #

sconcat :: NonEmpty (Vector a) -> Vector a Source #

stimes :: Integral b => b -> Vector a -> Vector a Source #

Storable a => Monoid (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

NFData (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

Methods

rnf :: Vector a -> () Source #

type Mutable Vector Source # 
Instance details

Defined in Data.Vector.Storable

type Item (Vector a) Source # 
Instance details

Defined in Data.Vector.Storable

type Item (Vector a) = a

data MVector s a Source #

Mutable Storable-based vectors

Constructors

MVector !Int !(ForeignPtr a) 

Instances

Instances details
Storable a => MVector MVector a Source # 
Instance details

Defined in Data.Vector.Storable.Mutable

NFData1 (MVector s) Source # 
Instance details

Defined in Data.Vector.Storable.Mutable

Methods

liftRnf :: (a -> ()) -> MVector s a -> () Source #

NFData (MVector s a) Source # 
Instance details

Defined in Data.Vector.Storable.Mutable

Methods

rnf :: MVector s a -> () Source #

class Storable a Source #

The member functions of this class facilitate writing values of primitive types to raw memory (which may have been allocated with the above mentioned routines) and reading values from blocks of raw memory. The class, furthermore, includes support for computing the storage requirements and alignment restrictions of storable types.

Memory addresses are represented as values of type Ptr a, for some a which is an instance of class Storable. The type argument to Ptr helps provide some valuable type safety in FFI code (you can't mix pointers of different types without an explicit cast), while helping the Haskell type system figure out which marshalling method is needed for a given pointer.

All marshalling between Haskell and a foreign language ultimately boils down to translating Haskell data structures into the binary representation of a corresponding data structure of the foreign language and vice versa. To code this marshalling in Haskell, it is necessary to manipulate primitive data types stored in unstructured memory blocks. The class Storable facilitates this manipulation on all types for which it is instantiated, which are the standard basic types of Haskell, the fixed size Int types (Int8, Int16, Int32, Int64), the fixed size Word types (Word8, Word16, Word32, Word64), StablePtr, all types from Foreign.C.Types, as well as Ptr.

Minimal complete definition

sizeOf, alignment, (peek | peekElemOff | peekByteOff), (poke | pokeElemOff | pokeByteOff)

Instances

Instances details
Storable Bool

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Char

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Double

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Float

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Int

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Int8

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Int16

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Int32

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Int64

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Word

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Word8

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Word16

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Word32

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable Word64

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable ()

Since: base-4.9.0.0

Instance details

Defined in Foreign.Storable

Methods

sizeOf :: () -> Int Source #

alignment :: () -> Int Source #

peekElemOff :: Ptr () -> Int -> IO () Source #

pokeElemOff :: Ptr () -> Int -> () -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO () Source #

pokeByteOff :: Ptr b -> Int -> () -> IO () Source #

peek :: Ptr () -> IO () Source #

poke :: Ptr () -> () -> IO () Source #

Storable CDev 
Instance details

Defined in System.Posix.Types

Storable CIno 
Instance details

Defined in System.Posix.Types

Storable CMode 
Instance details

Defined in System.Posix.Types

Storable COff 
Instance details

Defined in System.Posix.Types

Storable CPid 
Instance details

Defined in System.Posix.Types

Storable CSsize 
Instance details

Defined in System.Posix.Types

Storable CGid 
Instance details

Defined in System.Posix.Types

Storable CNlink 
Instance details

Defined in System.Posix.Types

Storable CUid 
Instance details

Defined in System.Posix.Types

Storable CCc 
Instance details

Defined in System.Posix.Types

Storable CSpeed 
Instance details

Defined in System.Posix.Types

Storable CTcflag 
Instance details

Defined in System.Posix.Types

Storable CRLim 
Instance details

Defined in System.Posix.Types

Storable CBlkSize 
Instance details

Defined in System.Posix.Types

Storable CBlkCnt 
Instance details

Defined in System.Posix.Types

Storable CClockId 
Instance details

Defined in System.Posix.Types

Storable CFsBlkCnt 
Instance details

Defined in System.Posix.Types

Storable CFsFilCnt 
Instance details

Defined in System.Posix.Types

Storable CId 
Instance details

Defined in System.Posix.Types

Storable CKey 
Instance details

Defined in System.Posix.Types

Storable CTimer 
Instance details

Defined in System.Posix.Types

Storable CSocklen 
Instance details

Defined in System.Posix.Types

Storable CNfds 
Instance details

Defined in System.Posix.Types

Storable Fd 
Instance details

Defined in System.Posix.Types

Methods

sizeOf :: Fd -> Int Source #

alignment :: Fd -> Int Source #

peekElemOff :: Ptr Fd -> Int -> IO Fd Source #

pokeElemOff :: Ptr Fd -> Int -> Fd -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO Fd Source #

pokeByteOff :: Ptr b -> Int -> Fd -> IO () Source #

peek :: Ptr Fd -> IO Fd Source #

poke :: Ptr Fd -> Fd -> IO () Source #

Storable CChar 
Instance details

Defined in Foreign.C.Types

Storable CSChar 
Instance details

Defined in Foreign.C.Types

Storable CUChar 
Instance details

Defined in Foreign.C.Types

Storable CShort 
Instance details

Defined in Foreign.C.Types

Storable CUShort 
Instance details

Defined in Foreign.C.Types

Storable CInt 
Instance details

Defined in Foreign.C.Types

Storable CUInt 
Instance details

Defined in Foreign.C.Types

Storable CLong 
Instance details

Defined in Foreign.C.Types

Storable CULong 
Instance details

Defined in Foreign.C.Types

Storable CLLong 
Instance details

Defined in Foreign.C.Types

Storable CULLong 
Instance details

Defined in Foreign.C.Types

Storable CBool 
Instance details

Defined in Foreign.C.Types

Storable CFloat 
Instance details

Defined in Foreign.C.Types

Storable CDouble 
Instance details

Defined in Foreign.C.Types

Storable CPtrdiff 
Instance details

Defined in Foreign.C.Types

Storable CSize 
Instance details

Defined in Foreign.C.Types

Storable CWchar 
Instance details

Defined in Foreign.C.Types

Storable CSigAtomic 
Instance details

Defined in Foreign.C.Types

Storable CClock 
Instance details

Defined in Foreign.C.Types

Storable CTime 
Instance details

Defined in Foreign.C.Types

Storable CUSeconds 
Instance details

Defined in Foreign.C.Types

Storable CSUSeconds 
Instance details

Defined in Foreign.C.Types

Storable CIntPtr 
Instance details

Defined in Foreign.C.Types

Storable CUIntPtr 
Instance details

Defined in Foreign.C.Types

Storable CIntMax 
Instance details

Defined in Foreign.C.Types

Storable CUIntMax 
Instance details

Defined in Foreign.C.Types

Storable WordPtr 
Instance details

Defined in Foreign.Ptr

Storable IntPtr 
Instance details

Defined in Foreign.Ptr

Storable Fingerprint

Since: base-4.4.0.0

Instance details

Defined in Foreign.Storable

(Storable a, Integral a) => Storable (Ratio a)

Since: base-4.8.0.0

Instance details

Defined in Foreign.Storable

Methods

sizeOf :: Ratio a -> Int Source #

alignment :: Ratio a -> Int Source #

peekElemOff :: Ptr (Ratio a) -> Int -> IO (Ratio a) Source #

pokeElemOff :: Ptr (Ratio a) -> Int -> Ratio a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (Ratio a) Source #

pokeByteOff :: Ptr b -> Int -> Ratio a -> IO () Source #

peek :: Ptr (Ratio a) -> IO (Ratio a) Source #

poke :: Ptr (Ratio a) -> Ratio a -> IO () Source #

Storable (StablePtr a)

Since: base-2.1

Instance details

Defined in Foreign.Storable

Storable (Ptr a)

Since: base-2.1

Instance details

Defined in Foreign.Storable

Methods

sizeOf :: Ptr a -> Int Source #

alignment :: Ptr a -> Int Source #

peekElemOff :: Ptr (Ptr a) -> Int -> IO (Ptr a) Source #

pokeElemOff :: Ptr (Ptr a) -> Int -> Ptr a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (Ptr a) Source #

pokeByteOff :: Ptr b -> Int -> Ptr a -> IO () Source #

peek :: Ptr (Ptr a) -> IO (Ptr a) Source #

poke :: Ptr (Ptr a) -> Ptr a -> IO () Source #

Storable (FunPtr a)

Since: base-2.1

Instance details

Defined in Foreign.Storable

Methods

sizeOf :: FunPtr a -> Int Source #

alignment :: FunPtr a -> Int Source #

peekElemOff :: Ptr (FunPtr a) -> Int -> IO (FunPtr a) Source #

pokeElemOff :: Ptr (FunPtr a) -> Int -> FunPtr a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (FunPtr a) Source #

pokeByteOff :: Ptr b -> Int -> FunPtr a -> IO () Source #

peek :: Ptr (FunPtr a) -> IO (FunPtr a) Source #

poke :: Ptr (FunPtr a) -> FunPtr a -> IO () Source #

Storable a => Storable (Complex a)

Since: base-4.8.0.0

Instance details

Defined in Data.Complex

Methods

sizeOf :: Complex a -> Int Source #

alignment :: Complex a -> Int Source #

peekElemOff :: Ptr (Complex a) -> Int -> IO (Complex a) Source #

pokeElemOff :: Ptr (Complex a) -> Int -> Complex a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (Complex a) Source #

pokeByteOff :: Ptr b -> Int -> Complex a -> IO () Source #

peek :: Ptr (Complex a) -> IO (Complex a) Source #

poke :: Ptr (Complex a) -> Complex a -> IO () Source #

Storable a => Storable (Identity a)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Storable a => Storable (Down a)

Since: base-4.14.0.0

Instance details

Defined in Data.Ord

Methods

sizeOf :: Down a -> Int Source #

alignment :: Down a -> Int Source #

peekElemOff :: Ptr (Down a) -> Int -> IO (Down a) Source #

pokeElemOff :: Ptr (Down a) -> Int -> Down a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (Down a) Source #

pokeByteOff :: Ptr b -> Int -> Down a -> IO () Source #

peek :: Ptr (Down a) -> IO (Down a) Source #

poke :: Ptr (Down a) -> Down a -> IO () Source #

Prim a => Storable (PrimStorable a) 
Instance details

Defined in Data.Primitive.Types

Storable a => Storable (Const a b)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Const

Methods

sizeOf :: Const a b -> Int Source #

alignment :: Const a b -> Int Source #

peekElemOff :: Ptr (Const a b) -> Int -> IO (Const a b) Source #

pokeElemOff :: Ptr (Const a b) -> Int -> Const a b -> IO () Source #

peekByteOff :: Ptr b0 -> Int -> IO (Const a b) Source #

pokeByteOff :: Ptr b0 -> Int -> Const a b -> IO () Source #

peek :: Ptr (Const a b) -> IO (Const a b) Source #

poke :: Ptr (Const a b) -> Const a b -> IO () Source #

Accessors

Length information

length :: Storable a => Vector a -> Int Source #

O(1) Yield the length of the vector

null :: Storable a => Vector a -> Bool Source #

O(1) Test whether a vector is empty

Indexing

(!) :: Storable a => Vector a -> Int -> a Source #

O(1) Indexing

(!?) :: Storable a => Vector a -> Int -> Maybe a Source #

O(1) Safe indexing

head :: Storable a => Vector a -> a Source #

O(1) First element

last :: Storable a => Vector a -> a Source #

O(1) Last element

unsafeIndex :: Storable a => Vector a -> Int -> a Source #

O(1) Unsafe indexing without bounds checking

unsafeHead :: Storable a => Vector a -> a Source #

O(1) First element without checking if the vector is empty

unsafeLast :: Storable a => Vector a -> a Source #

O(1) Last element without checking if the vector is empty

Monadic indexing

indexM :: (Storable a, Monad m) => Vector 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 elements) is evaluated eagerly.

headM :: (Storable a, Monad m) => Vector 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 :: (Storable a, Monad m) => Vector 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 :: (Storable a, Monad m) => Vector 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 :: (Storable a, Monad m) => Vector 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 :: (Storable a, Monad m) => Vector 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)

slice Source #

Arguments

:: Storable a 
=> Int

i starting index

-> Int

n length

-> Vector a 
-> Vector a 

O(1) Yield a slice of the vector without copying it. The vector must contain at least i+n elements.

init :: Storable a => Vector a -> Vector a Source #

O(1) Yield all but the last element without copying. The vector may not be empty.

tail :: Storable a => Vector a -> Vector a Source #

O(1) Yield all but the first element without copying. The vector may not be empty.

take :: Storable a => Int -> Vector a -> Vector a Source #

O(1) Yield at the first n elements without copying. The vector may contain less than n elements in which case it is returned unchanged.

drop :: Storable a => Int -> Vector a -> Vector 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.

splitAt :: Storable a => Int -> Vector a -> (Vector a, Vector a) Source #

O(1) Yield the first n elements paired with the remainder without copying.

Note that splitAt n v is equivalent to (take n v, drop n v) but slightly more efficient.

Since: 0.7.1

uncons :: Storable a => Vector a -> Maybe (a, Vector a) Source #

O(1) Yield the head and tail of the vector, or Nothing if empty.

Since: 0.12.2.0

unsnoc :: Storable a => Vector a -> Maybe (Vector a, a) Source #

O(1) Yield the last and init of the vector, or Nothing if empty.

Since: 0.12.2.0

unsafeSlice Source #

Arguments

:: Storable a 
=> Int

i starting index

-> Int

n length

-> Vector a 
-> Vector a 

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 :: Storable a => Vector a -> Vector a Source #

O(1) Yield all but the last element without copying. The vector may not be empty but this is not checked.

unsafeTail :: Storable a => Vector a -> Vector a Source #

O(1) Yield all but the first element without copying. The vector may not be empty but this is not checked.

unsafeTake :: Storable a => Int -> Vector a -> Vector 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 :: Storable a => Int -> Vector a -> Vector 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

empty :: Storable a => Vector a Source #

O(1) Empty vector

singleton :: Storable a => a -> Vector a Source #

O(1) Vector with exactly one element

replicate :: Storable a => Int -> a -> Vector a Source #

O(n) Vector of the given length with the same value in each position

generate :: Storable a => Int -> (Int -> a) -> Vector a Source #

O(n) Construct a vector of the given length by applying the function to each index

iterateN :: Storable a => Int -> (a -> a) -> a -> Vector a Source #

O(n) Apply function \(\max(n - 1, 0)\) times to an initial value, producing a vector of length \(\max(n, 0)\). Zeroth element will contain the initial value, that's why there is one less function application than the number of elements in the produced vector.

\( \underbrace{x, f (x), f (f (x)), \ldots}_{\max(0,n)\rm{~elements}} \)

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.iterateN 0 undefined undefined :: VS.Vector Int
[]
>>> VS.iterateN 26 succ 'a'
"abcdefghijklmnopqrstuvwxyz"

Since: 0.7.1

Monadic initialisation

replicateM :: (Monad m, Storable a) => Int -> m a -> m (Vector a) Source #

O(n) Execute the monadic action the given number of times and store the results in a vector.

generateM :: (Monad m, Storable a) => Int -> (Int -> m a) -> m (Vector a) Source #

O(n) Construct a vector of the given length by applying the monadic action to each index

iterateNM :: (Monad m, Storable a) => Int -> (a -> m a) -> a -> m (Vector a) Source #

O(n) Apply monadic function \(\max(n - 1, 0)\) times to an initial value, producing a vector of length \(\max(n, 0)\). Zeroth element will contain the initial value, that's why there is one less function application than the number of elements in the produced vector.

For non-monadic version see iterateN

Since: 0.12.0.0

create :: Storable a => (forall s. ST s (MVector s a)) -> Vector a Source #

Execute the monadic action and freeze the resulting vector.

create (do { v <- new 2; write v 0 'a'; write v 1 'b'; return v }) = <a,b>

createT :: (Traversable f, Storable a) => (forall s. ST s (f (MVector s a))) -> f (Vector a) Source #

Execute the monadic action and freeze the resulting vectors.

Unfolding

unfoldr :: Storable a => (b -> Maybe (a, b)) -> b -> Vector a Source #

O(n) Construct a vector by repeatedly applying the generator function to a seed. The generator function yields Just the next element and the new seed or Nothing if there are no more elements.

unfoldr (\n -> if n == 0 then Nothing else Just (n,n-1)) 10
 = <10,9,8,7,6,5,4,3,2,1>

unfoldrN :: Storable a => Int -> (b -> Maybe (a, b)) -> b -> Vector a Source #

O(n) Construct a vector with at most n elements by repeatedly applying the generator function to a seed. The generator function yields Just the next element and the new seed or Nothing if there are no more elements.

unfoldrN 3 (\n -> Just (n,n-1)) 10 = <10,9,8>

unfoldrExactN :: Storable a => Int -> (b -> (a, b)) -> b -> Vector 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,n-1)) 10 = <10,9,8>

Since: 0.12.2.0

unfoldrM :: (Monad m, Storable a) => (b -> m (Maybe (a, b))) -> b -> m (Vector a) Source #

O(n) Construct a vector by repeatedly applying the monadic generator function to a seed. The generator function yields Just the next element and the new seed or Nothing if there are no more elements.

unfoldrNM :: (Monad m, Storable a) => Int -> (b -> m (Maybe (a, b))) -> b -> m (Vector a) Source #

O(n) Construct a vector by repeatedly applying the monadic generator function to a seed. The generator function yields Just the next element and the new seed or Nothing if there are no more elements.

unfoldrExactNM :: (Monad m, Storable a) => Int -> (b -> m (a, b)) -> b -> m (Vector 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 :: Storable a => Int -> (Vector a -> a) -> Vector 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 :: Storable a => Int -> (Vector a -> a) -> Vector 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 :: (Storable a, Num a) => a -> Int -> Vector 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 :: (Storable a, Num a) => a -> a -> Int -> Vector 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 0.1 5 = <1,1.1,1.2,1.3,1.4>

enumFromTo :: (Storable a, Enum a) => a -> a -> Vector a Source #

O(n) Enumerate values from x to y.

WARNING: This operation can be very inefficient. If at all possible, use enumFromN instead.

enumFromThenTo :: (Storable a, Enum a) => a -> a -> a -> Vector a Source #

O(n) Enumerate values from x to y with a specific step z.

WARNING: This operation can be very inefficient. If at all possible, use enumFromStepN instead.

Concatenation

cons :: Storable a => a -> Vector a -> Vector a Source #

O(n) Prepend an element

snoc :: Storable a => Vector a -> a -> Vector a Source #

O(n) Append an element

(++) :: Storable a => Vector a -> Vector a -> Vector a infixr 5 Source #

O(m+n) Concatenate two vectors

concat :: Storable a => [Vector a] -> Vector a Source #

O(n) Concatenate all vectors in the list

Restricting memory usage

force :: Storable a => Vector a -> Vector 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

(//) Source #

Arguments

:: Storable a 
=> Vector a

initial vector (of length m)

-> [(Int, a)]

list of index/value pairs (of length n)

-> Vector a 

O(m+n) For each pair (i,a) from the list, replace the vector element at position i by a.

<5,9,2,7> // [(2,1),(0,3),(2,8)] = <3,9,8,7>

update_ Source #

Arguments

:: Storable a 
=> Vector a

initial vector (of length m)

-> Vector Int

index vector (of length n1)

-> Vector a

value vector (of length n2)

-> Vector 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>

unsafeUpd :: Storable a => Vector a -> [(Int, a)] -> Vector a Source #

Same as (//) but without bounds checking.

unsafeUpdate_ :: Storable a => Vector a -> Vector Int -> Vector a -> Vector a Source #

Same as update_ but without bounds checking.

Accumulations

accum Source #

Arguments

:: Storable a 
=> (a -> b -> a)

accumulating function f

-> Vector a

initial vector (of length m)

-> [(Int, b)]

list of index/value pairs (of length n)

-> Vector 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

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.accum (+) (VS.fromList [1000.0,2000.0,3000.0]) [(2,4),(1,6),(0,3),(1,10)]
[1003.0,2016.0,3004.0]

accumulate_ Source #

Arguments

:: (Storable a, Storable b) 
=> (a -> b -> a)

accumulating function f

-> Vector a

initial vector (of length m)

-> Vector Int

index vector (of length n1)

-> Vector b

value vector (of length n2)

-> Vector 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>

unsafeAccum :: Storable a => (a -> b -> a) -> Vector a -> [(Int, b)] -> Vector a Source #

Same as accum but without bounds checking.

unsafeAccumulate_ :: (Storable a, Storable b) => (a -> b -> a) -> Vector a -> Vector Int -> Vector b -> Vector a Source #

Same as accumulate_ but without bounds checking.

Permutations

reverse :: Storable a => Vector a -> Vector a Source #

O(n) Reverse a vector

backpermute :: Storable a => Vector a -> Vector Int -> Vector a Source #

O(n) Yield the vector obtained by replacing each element i of the index vector by xs!i. This is equivalent to map (xs!) is but is often much more efficient.

backpermute <a,b,c,d> <0,3,2,3,1,0> = <a,d,c,d,b,a>

unsafeBackpermute :: Storable a => Vector a -> Vector Int -> Vector a Source #

Same as backpermute but without bounds checking.

Safe destructive updates

modify :: Storable a => (forall s. MVector s a -> ST s ()) -> Vector a -> Vector a Source #

Apply a destructive operation to a vector. The operation will be performed in place if it is safe to do so and will modify a copy of the vector otherwise.

modify (\v -> write v 0 'x') (replicate 3 'a') = <'x','a','a'>

Elementwise operations

Mapping

map :: (Storable a, Storable b) => (a -> b) -> Vector a -> Vector b Source #

O(n) Map a function over a vector

imap :: (Storable a, Storable b) => (Int -> a -> b) -> Vector a -> Vector b Source #

O(n) Apply a function to every element of a vector and its index

concatMap :: (Storable a, Storable b) => (a -> Vector b) -> Vector a -> Vector b Source #

Map a function over a vector and concatenate the results.

Monadic mapping

mapM :: (Monad m, Storable a, Storable b) => (a -> m b) -> Vector a -> m (Vector b) Source #

O(n) Apply the monadic action to all elements of the vector, yielding a vector of results

imapM :: (Monad m, Storable a, Storable b) => (Int -> a -> m b) -> Vector a -> m (Vector b) Source #

O(n) Apply the monadic action to every element of a vector and its index, yielding a vector of results

Since: 0.12.2.0

mapM_ :: (Monad m, Storable a) => (a -> m b) -> Vector a -> m () Source #

O(n) Apply the monadic action to all elements of a vector and ignore the results

imapM_ :: (Monad m, Storable a) => (Int -> a -> m b) -> Vector a -> m () Source #

O(n) Apply the monadic action to every element of a vector and its index, ignoring the results

Since: 0.12.2.0

forM :: (Monad m, Storable a, Storable b) => Vector a -> (a -> m b) -> m (Vector 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, Storable a) => Vector 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_.

iforM :: (Monad m, Storable a, Storable b) => Vector a -> (Int -> a -> m b) -> m (Vector b) Source #

O(n) Apply the monadic action to all elements of the vector and their indices, yielding a vector of results. Equivalent to flip imapM.

Since: 0.12.2.0

iforM_ :: (Monad m, Storable a) => Vector a -> (Int -> a -> m b) -> m () Source #

O(n) Apply the monadic action to all elements of the vector and their indices and ignore the results. Equivalent to flip imapM_.

Since: 0.12.2.0

Zipping

zipWith :: (Storable a, Storable b, Storable c) => (a -> b -> c) -> Vector a -> Vector b -> Vector c Source #

O(min(m,n)) Zip two vectors with the given function.

zipWith3 :: (Storable a, Storable b, Storable c, Storable d) => (a -> b -> c -> d) -> Vector a -> Vector b -> Vector c -> Vector d Source #

Zip three vectors with the given function.

zipWith4 :: (Storable a, Storable b, Storable c, Storable d, Storable e) => (a -> b -> c -> d -> e) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e Source #

zipWith5 :: (Storable a, Storable b, Storable c, Storable d, Storable e, Storable f) => (a -> b -> c -> d -> e -> f) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e -> Vector f Source #

zipWith6 :: (Storable a, Storable b, Storable c, Storable d, Storable e, Storable f, Storable g) => (a -> b -> c -> d -> e -> f -> g) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e -> Vector f -> Vector g Source #

izipWith :: (Storable a, Storable b, Storable c) => (Int -> a -> b -> c) -> Vector a -> Vector b -> Vector c Source #

O(min(m,n)) Zip two vectors with a function that also takes the elements' indices.

izipWith3 :: (Storable a, Storable b, Storable c, Storable d) => (Int -> a -> b -> c -> d) -> Vector a -> Vector b -> Vector c -> Vector d Source #

Zip three vectors and their indices with the given function.

izipWith4 :: (Storable a, Storable b, Storable c, Storable d, Storable e) => (Int -> a -> b -> c -> d -> e) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e Source #

izipWith5 :: (Storable a, Storable b, Storable c, Storable d, Storable e, Storable f) => (Int -> a -> b -> c -> d -> e -> f) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e -> Vector f Source #

izipWith6 :: (Storable a, Storable b, Storable c, Storable d, Storable e, Storable f, Storable g) => (Int -> a -> b -> c -> d -> e -> f -> g) -> Vector a -> Vector b -> Vector c -> Vector d -> Vector e -> Vector f -> Vector g Source #

Monadic zipping

zipWithM :: (Monad m, Storable a, Storable b, Storable c) => (a -> b -> m c) -> Vector a -> Vector b -> m (Vector c) Source #

O(min(m,n)) Zip the two vectors with the monadic action and yield a vector of results

izipWithM :: (Monad m, Storable a, Storable b, Storable c) => (Int -> a -> b -> m c) -> Vector a -> Vector b -> m (Vector 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

Since: 0.12.2.0

zipWithM_ :: (Monad m, Storable a, Storable b) => (a -> b -> m c) -> Vector a -> Vector b -> m () Source #

O(min(m,n)) Zip the two vectors with the monadic action and ignore the results

izipWithM_ :: (Monad m, Storable a, Storable b) => (Int -> a -> b -> m c) -> Vector a -> Vector 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

Since: 0.12.2.0

Working with predicates

Filtering

filter :: Storable a => (a -> Bool) -> Vector a -> Vector a Source #

O(n) Drop elements that do not satisfy the predicate

ifilter :: Storable a => (Int -> a -> Bool) -> Vector a -> Vector a Source #

O(n) Drop elements that do not satisfy the predicate which is applied to values and their indices

filterM :: (Monad m, Storable a) => (a -> m Bool) -> Vector a -> m (Vector a) Source #

O(n) Drop elements that do not satisfy the monadic predicate

uniq :: (Storable a, Eq a) => Vector a -> Vector a Source #

O(n) Drop repeated adjacent elements.

mapMaybe :: (Storable a, Storable b) => (a -> Maybe b) -> Vector a -> Vector b Source #

O(n) Drop elements when predicate returns Nothing

imapMaybe :: (Storable a, Storable b) => (Int -> a -> Maybe b) -> Vector a -> Vector b Source #

O(n) Drop elements when predicate, applied to index and value, returns Nothing

mapMaybeM :: (Monad m, Storable a, Storable b) => (a -> m (Maybe b)) -> Vector a -> m (Vector b) Source #

O(n) Apply monadic function to each element of vector and discard elements returning Nothing.

Since: 0.12.2.0

imapMaybeM :: (Monad m, Storable a, Storable b) => (Int -> a -> m (Maybe b)) -> Vector a -> m (Vector b) Source #

O(n) Apply monadic function to each element of vector and its index. Discards elements returning Nothing.

Since: 0.12.2.0

takeWhile :: Storable a => (a -> Bool) -> Vector a -> Vector a Source #

O(n) Yield the longest prefix of elements satisfying the predicate. Current implementation is not copy-free, unless the result vector is fused away.

dropWhile :: Storable a => (a -> Bool) -> Vector a -> Vector a Source #

O(n) Drop the longest prefix of elements that satisfy the predicate without copying.

Partitioning

partition :: Storable a => (a -> Bool) -> Vector a -> (Vector a, Vector 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.

unstablePartition :: Storable a => (a -> Bool) -> Vector a -> (Vector a, Vector 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.

partitionWith :: (Storable a, Storable b, Storable c) => (a -> Either b c) -> Vector a -> (Vector b, Vector c) Source #

O(n) Split the vector into two parts, the first one containing the Left elements and the second containing the Right elements. The relative order of the elements is preserved.

Since: 0.12.1.0

span :: Storable a => (a -> Bool) -> Vector a -> (Vector a, Vector a) Source #

O(n) Split the vector into the longest prefix of elements that satisfy the predicate and the rest without copying.

break :: Storable a => (a -> Bool) -> Vector a -> (Vector a, Vector a) Source #

O(n) Split the vector into the longest prefix of elements that do not satisfy the predicate and the rest without copying.

Searching

elem :: (Storable a, Eq a) => a -> Vector a -> Bool infix 4 Source #

O(n) Check if the vector contains an element

notElem :: (Storable a, Eq a) => a -> Vector a -> Bool infix 4 Source #

O(n) Check if the vector does not contain an element (inverse of elem)

find :: Storable a => (a -> Bool) -> Vector a -> Maybe a Source #

O(n) Yield Just the first element matching the predicate or Nothing if no such element exists.

findIndex :: Storable a => (a -> Bool) -> Vector a -> Maybe Int Source #

O(n) Yield Just the index of the first element matching the predicate or Nothing if no such element exists.

findIndices :: Storable a => (a -> Bool) -> Vector a -> Vector Int Source #

O(n) Yield the indices of elements satisfying the predicate in ascending order.

elemIndex :: (Storable a, Eq a) => a -> Vector a -> Maybe Int Source #

O(n) Yield Just the index of the first occurence of the given element or Nothing if the vector does not contain the element. This is a specialised version of findIndex.

elemIndices :: (Storable a, Eq a) => a -> Vector a -> Vector Int Source #

O(n) Yield the indices of all occurences of the given element in ascending order. This is a specialised version of findIndices.

Folding

foldl :: Storable b => (a -> b -> a) -> a -> Vector b -> a Source #

O(n) Left fold

foldl1 :: Storable a => (a -> a -> a) -> Vector a -> a Source #

O(n) Left fold on non-empty vectors

foldl' :: Storable b => (a -> b -> a) -> a -> Vector b -> a Source #

O(n) Left fold with strict accumulator

foldl1' :: Storable a => (a -> a -> a) -> Vector a -> a Source #

O(n) Left fold on non-empty vectors with strict accumulator

foldr :: Storable a => (a -> b -> b) -> b -> Vector a -> b Source #

O(n) Right fold

foldr1 :: Storable a => (a -> a -> a) -> Vector a -> a Source #

O(n) Right fold on non-empty vectors

foldr' :: Storable a => (a -> b -> b) -> b -> Vector a -> b Source #

O(n) Right fold with a strict accumulator

foldr1' :: Storable a => (a -> a -> a) -> Vector a -> a Source #

O(n) Right fold on non-empty vectors with strict accumulator

ifoldl :: Storable b => (a -> Int -> b -> a) -> a -> Vector b -> a Source #

O(n) Left fold (function applied to each element and its index)

ifoldl' :: Storable b => (a -> Int -> b -> a) -> a -> Vector b -> a Source #

O(n) Left fold with strict accumulator (function applied to each element and its index)

ifoldr :: Storable a => (Int -> a -> b -> b) -> b -> Vector a -> b Source #

O(n) Right fold (function applied to each element and its index)

ifoldr' :: Storable a => (Int -> a -> b -> b) -> b -> Vector a -> b Source #

O(n) Right fold with strict accumulator (function applied to each element and its index)

foldMap :: (Monoid m, Storable a) => (a -> m) -> Vector a -> m Source #

O(n) Map each element of the structure to a monoid, and combine the results. It uses same implementation as corresponding method of Foldable type cless. Note it's implemented in terms of foldr and won't fuse with functions that traverse vector from left to right (map, generate, etc.).

Since: 0.12.2.0

foldMap' :: (Monoid m, Storable a) => (a -> m) -> Vector a -> m Source #

O(n) foldMap which is strict in accumulator. It uses same implementation as corresponding method of Foldable type class. Note it's implemented in terms of foldl' so it fuses in most contexts.

Since: 0.12.2.0

Specialised folds

all :: Storable a => (a -> Bool) -> Vector a -> Bool Source #

O(n) Check if all elements satisfy the predicate.

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.all even $ VS.fromList [2, 4, 12 :: Int]
True
>>> VS.all even $ VS.fromList [2, 4, 13 :: Int]
False
>>> VS.all even (VS.empty :: VS.Vector Int)
True

any :: Storable a => (a -> Bool) -> Vector a -> Bool Source #

O(n) Check if any element satisfies the predicate.

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.any even $ VS.fromList [1, 3, 7 :: Int]
False
>>> VS.any even $ VS.fromList [3, 2, 13 :: Int]
True
>>> VS.any even (VS.empty :: VS.Vector Int)
False

and :: Vector Bool -> Bool Source #

O(n) Check if all elements are True

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.and $ VS.fromList [True, False]
False
>>> VS.and VS.empty
True

or :: Vector Bool -> Bool Source #

O(n) Check if any element is True

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.or $ VS.fromList [True, False]
True
>>> VS.or VS.empty
False

sum :: (Storable a, Num a) => Vector a -> a Source #

O(n) Compute the sum of the elements

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.sum $ VS.fromList [300,20,1 :: Int]
321
>>> VS.sum (VS.empty :: VS.Vector Int)
0

product :: (Storable a, Num a) => Vector a -> a Source #

O(n) Compute the produce of the elements

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.product $ VS.fromList [1,2,3,4 :: Int]
24
>>> VS.product (VS.empty :: VS.Vector Int)
1

maximum :: (Storable a, Ord a) => Vector a -> a Source #

O(n) Yield the maximum element of the vector. The vector may not be empty.

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.maximum $ VS.fromList [2.0, 1.0]
2.0

maximumBy :: Storable a => (a -> a -> Ordering) -> Vector a -> a Source #

O(n) Yield the maximum element of the vector according to the given comparison function. The vector may not be empty.

minimum :: (Storable a, Ord a) => Vector a -> a Source #

O(n) Yield the minimum element of the vector. The vector may not be empty.

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.minimum $ VS.fromList [2.0, 1.0]
1.0

minimumBy :: Storable a => (a -> a -> Ordering) -> Vector a -> a Source #

O(n) Yield the minimum element of the vector according to the given comparison function. The vector may not be empty.

minIndex :: (Storable a, Ord a) => Vector a -> Int Source #

O(n) Yield the index of the minimum element of the vector. The vector may not be empty.

minIndexBy :: Storable a => (a -> a -> Ordering) -> Vector 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.

maxIndex :: (Storable a, Ord a) => Vector a -> Int Source #

O(n) Yield the index of the maximum element of the vector. The vector may not be empty.

maxIndexBy :: Storable a => (a -> a -> Ordering) -> Vector 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.

Monadic folds

foldM :: (Monad m, Storable b) => (a -> b -> m a) -> a -> Vector b -> m a Source #

O(n) Monadic fold

ifoldM :: (Monad m, Storable b) => (a -> Int -> b -> m a) -> a -> Vector b -> m a Source #

O(n) Monadic fold (action applied to each element and its index)

Since: 0.12.2.0

foldM' :: (Monad m, Storable b) => (a -> b -> m a) -> a -> Vector b -> m a Source #

O(n) Monadic fold with strict accumulator

ifoldM' :: (Monad m, Storable b) => (a -> Int -> b -> m a) -> a -> Vector b -> m a Source #

O(n) Monadic fold with strict accumulator (action applied to each element and its index)

Since: 0.12.2.0

fold1M :: (Monad m, Storable a) => (a -> a -> m a) -> Vector a -> m a Source #

O(n) Monadic fold over non-empty vectors

fold1M' :: (Monad m, Storable a) => (a -> a -> m a) -> Vector a -> m a Source #

O(n) Monadic fold over non-empty vectors with strict accumulator

foldM_ :: (Monad m, Storable b) => (a -> b -> m a) -> a -> Vector b -> m () Source #

O(n) Monadic fold that discards the result

ifoldM_ :: (Monad m, Storable b) => (a -> Int -> b -> m a) -> a -> Vector b -> m () Source #

O(n) Monadic fold that discards the result (action applied to each element and its index)

Since: 0.12.2.0

foldM'_ :: (Monad m, Storable b) => (a -> b -> m a) -> a -> Vector b -> m () Source #

O(n) Monadic fold with strict accumulator that discards the result

ifoldM'_ :: (Monad m, Storable b) => (a -> Int -> b -> m a) -> a -> Vector b -> m () Source #

O(n) Monadic fold with strict accumulator that discards the result (action applied to each element and its index)

Since: 0.12.2.0

fold1M_ :: (Monad m, Storable a) => (a -> a -> m a) -> Vector a -> m () Source #

O(n) Monadic fold over non-empty vectors that discards the result

fold1M'_ :: (Monad m, Storable a) => (a -> a -> m a) -> Vector a -> m () Source #

O(n) Monadic fold over non-empty vectors with strict accumulator that discards the result

Prefix sums (scans)

prescanl :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Prescan

prescanl f z = init . scanl f z

Example: prescanl (+) 0 <1,2,3,4> = <0,1,3,6>

prescanl' :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Prescan with strict accumulator

postscanl :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Scan

postscanl f z = tail . scanl f z

Example: postscanl (+) 0 <1,2,3,4> = <1,3,6,10>

postscanl' :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Scan with strict accumulator

scanl :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Haskell-style scan

scanl f z <x1,...,xn> = <y1,...,y(n+1)>
  where y1 = z
        yi = f y(i-1) x(i-1)

Example: scanl (+) 0 <1,2,3,4> = <0,1,3,6,10>

scanl' :: (Storable a, Storable b) => (a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Haskell-style scan with strict accumulator

scanl1 :: Storable a => (a -> a -> a) -> Vector a -> Vector a Source #

O(n) Scan over a non-empty vector

scanl f <x1,...,xn> = <y1,...,yn>
  where y1 = x1
        yi = f y(i-1) xi

scanl1' :: Storable a => (a -> a -> a) -> Vector a -> Vector a Source #

O(n) Scan over a non-empty vector with a strict accumulator

iscanl :: (Storable a, Storable b) => (Int -> a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Scan over a vector with its index

Since: 0.12.2.0

iscanl' :: (Storable a, Storable b) => (Int -> a -> b -> a) -> a -> Vector b -> Vector a Source #

O(n) Scan over a vector (strictly) with its index

Since: 0.12.2.0

prescanr :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left prescan

prescanr f z = reverse . prescanl (flip f) z . reverse

prescanr' :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left prescan with strict accumulator

postscanr :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left scan

postscanr' :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left scan with strict accumulator

scanr :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left Haskell-style scan

scanr' :: (Storable a, Storable b) => (a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left Haskell-style scan with strict accumulator

scanr1 :: Storable a => (a -> a -> a) -> Vector a -> Vector a Source #

O(n) Right-to-left scan over a non-empty vector

scanr1' :: Storable a => (a -> a -> a) -> Vector a -> Vector a Source #

O(n) Right-to-left scan over a non-empty vector with a strict accumulator

iscanr :: (Storable a, Storable b) => (Int -> a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left scan over a vector with its index

Since: 0.12.2.0

iscanr' :: (Storable a, Storable b) => (Int -> a -> b -> b) -> b -> Vector a -> Vector b Source #

O(n) Right-to-left scan over a vector (strictly) with its index

Since: 0.12.2.0

Comparisons

eqBy :: (Storable a, Storable b) => (a -> b -> Bool) -> Vector a -> Vector b -> Bool Source #

O(n) Check if two vectors are equal using supplied equality predicate.

Since: 0.12.2.0

cmpBy :: (Storable a, Storable b) => (a -> b -> Ordering) -> Vector a -> Vector b -> Ordering Source #

O(n) Compare two vectors using supplied comparison function for vector elements. Comparison works same as for lists.

cmpBy compare == compare

Since: 0.12.2.0

Utilities

Comparisons

isSameVector :: Storable a => Vector a -> Vector a -> Bool Source #

Checks whether two values are same vector: they have same length and share same buffer.

>>> let xs = fromList [0/0::Double] in isSameVector xs xs
True

Conversions

Lists

toList :: Storable a => Vector a -> [a] Source #

O(n) Convert a vector to a list

fromList :: Storable a => [a] -> Vector a Source #

O(n) Convert a list to a vector

fromListN :: Storable a => Int -> [a] -> Vector a Source #

O(n) Convert the first n elements of a list to a vector

fromListN n xs = fromList (take n xs)

Examples

Expand
>>> import qualified Data.Vector.Storable as VS
>>> VS.fromListN 3 [1,2,3,4,5::Int]
[1,2,3]
>>> VS.fromListN 3 [1::Int]
[1]

Other vector types

convert :: (Vector v a, Vector w a) => v a -> w a Source #

O(n) Convert different vector types

unsafeCast :: forall a b. (Storable a, Storable b) => Vector a -> Vector b Source #

O(1) Unsafely cast a vector from one element type to another. The operation just changes the type of the underlying pointer and does not modify the elements.

The resulting vector contains as many elements as can fit into the underlying memory block.

Mutable vectors

freeze :: (Storable a, PrimMonad m) => MVector (PrimState m) a -> m (Vector a) Source #

O(n) Yield an immutable copy of the mutable vector.

thaw :: (Storable a, PrimMonad m) => Vector a -> m (MVector (PrimState m) a) Source #

O(n) Yield a mutable copy of the immutable vector.

copy :: (Storable a, PrimMonad m) => MVector (PrimState m) a -> Vector a -> m () Source #

O(n) Copy an immutable vector into a mutable one. The two vectors must have the same length.

unsafeFreeze :: (Storable a, PrimMonad m) => MVector (PrimState m) a -> m (Vector a) Source #

O(1) Unsafe convert a mutable vector to an immutable one without copying. The mutable vector may not be used after this operation.

unsafeThaw :: (Storable a, PrimMonad m) => Vector a -> m (MVector (PrimState m) a) Source #

O(1) Unsafely convert an immutable vector to a mutable one without copying. Note that this is very dangerous function and generally it's only safe to read from resulting vector. In which case immutable vector could be used safely as well.

Problem with mutation happens because GHC has a lot of freedom to introduce sharing. As a result mutable vectors produced by unsafeThaw may or may not share 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 all calls to do_something will use same buffer with possibly disastrous results. Whether such aliasing happens or not depends on program in question, optimization levels, and GHC flags.

All in all attempts to modify vector after unsafeThaw falls out of domain of software engineering and into realm of black magic, dark rituals, and unspeakable horrors. Only advice that could be given is: "don't attempt to mutate vector after unsafeThaw unless you know how to prevent GHC from aliasing buffers accidentally. We don't"

unsafeCopy :: (Storable a, PrimMonad m) => MVector (PrimState m) a -> Vector 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.

Raw pointers

unsafeFromForeignPtr Source #

Arguments

:: Storable a 
=> ForeignPtr a

pointer

-> Int

offset

-> Int

length

-> Vector a 

O(1) Create a vector from a ForeignPtr with an offset and a length.

The data may not be modified through the ForeignPtr afterwards.

If your offset is 0 it is more efficient to use unsafeFromForeignPtr0.

unsafeFromForeignPtr0 Source #

Arguments

:: Storable a 
=> ForeignPtr a

pointer

-> Int

length

-> Vector a 

O(1) Create a vector from a ForeignPtr and a length.

It is assumed the pointer points directly to the data (no offset). Use unsafeFromForeignPtr if you need to specify an offset.

The data may not be modified through the ForeignPtr afterwards.

unsafeToForeignPtr :: Storable a => Vector a -> (ForeignPtr a, Int, Int) Source #

O(1) Yield the underlying ForeignPtr together with the offset to the data and its length. The data may not be modified through the ForeignPtr.

unsafeToForeignPtr0 :: Storable a => Vector a -> (ForeignPtr a, Int) Source #

O(1) Yield the underlying ForeignPtr together with its length.

You can assume the pointer points directly to the data (no offset).

The data may not be modified through the ForeignPtr.

unsafeWith :: Storable a => Vector a -> (Ptr a -> IO b) -> IO b Source #

Pass a pointer to the vector's data to the IO action. The data may not be modified through the 'Ptr.