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|
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Packed.Vector
-- Copyright : (c) Alberto Ruiz 2007-10
-- License : BSD3
-- Maintainer : Alberto Ruiz
-- Stability : provisional
--
-- 1D arrays suitable for numeric computations using external libraries.
--
-- This module provides basic functions for manipulation of structure.
--
-----------------------------------------------------------------------------
{-# OPTIONS_HADDOCK hide #-}
module Data.Packed.Vector (
Vector,
fromList, (|>), toList, buildVector,
dim, (@>),
subVector, takesV, vjoin, join,
mapVector, mapVectorWithIndex, zipVector, zipVectorWith, unzipVector, unzipVectorWith,
mapVectorM, mapVectorM_, mapVectorWithIndexM, mapVectorWithIndexM_,
foldLoop, foldVector, foldVectorG, foldVectorWithIndex,
toByteString, fromByteString
) where
import Data.Packed.Internal.Vector
import Foreign.Storable
-------------------------------------------------------------------
#ifdef BINARY
import Data.Binary
import Control.Monad(replicateM)
import Data.ByteString.Internal as BS
import Foreign.ForeignPtr(castForeignPtr)
import Data.Vector.Storable.Internal(updPtr)
import Foreign.Ptr(plusPtr)
-- a 64K cache, with a Double taking 13 bytes in Bytestring,
-- implies a chunk size of 5041
chunk :: Int
chunk = 5000
chunks :: Int -> [Int]
chunks d = let c = d `div` chunk
m = d `mod` chunk
in if m /= 0 then reverse (m:(replicate c chunk)) else (replicate c chunk)
putVector v = mapM_ put $! toList v
getVector d = do
xs <- replicateM d get
return $! fromList xs
--------------------------------------------------------------------------------
toByteString :: Storable t => Vector t -> ByteString
toByteString v = BS.PS (castForeignPtr fp) (sz*o) (sz * dim v)
where
(fp,o,_n) = unsafeToForeignPtr v
sz = sizeOf (v@>0)
fromByteString :: Storable t => ByteString -> Vector t
fromByteString (BS.PS fp o n) = r
where
r = unsafeFromForeignPtr (castForeignPtr (updPtr (`plusPtr` o) fp)) 0 n'
n' = n `div` sz
sz = sizeOf (r@>0)
--------------------------------------------------------------------------------
instance (Binary a, Storable a) => Binary (Vector a) where
put v = do
let d = dim v
put d
mapM_ putVector $! takesV (chunks d) v
-- put = put . v2bs
get = do
d <- get
vs <- mapM getVector $ chunks d
return $! vjoin vs
-- get = fmap bs2v get
#endif
-------------------------------------------------------------------
{- | creates a Vector of the specified length using the supplied function to
to map the index to the value at that index.
@> buildVector 4 fromIntegral
4 |> [0.0,1.0,2.0,3.0]@
-}
buildVector :: Storable a => Int -> (Int -> a) -> Vector a
buildVector len f =
fromList $ map f [0 .. (len - 1)]
-- | zip for Vectors
zipVector :: (Storable a, Storable b, Storable (a,b)) => Vector a -> Vector b -> Vector (a,b)
zipVector = zipVectorWith (,)
-- | unzip for Vectors
unzipVector :: (Storable a, Storable b, Storable (a,b)) => Vector (a,b) -> (Vector a,Vector b)
unzipVector = unzipVectorWith id
-------------------------------------------------------------------
{-# DEPRECATED join "use vjoin or Data.Vector.concat" #-}
join :: Storable t => [Vector t] -> Vector t
join = vjoin
|
