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|
{-# OPTIONS_GHC -fglasgow-exts #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Packed.Internal.Vector
-- Copyright : (c) Alberto Ruiz 2007
-- License : GPL-style
--
-- Maintainer : Alberto Ruiz <aruiz@um.es>
-- Stability : provisional
-- Portability : portable (uses FFI)
--
-- Vector implementation
--
-----------------------------------------------------------------------------
module Data.Packed.Internal.Vector where
import Data.Packed.Internal.Common
import Foreign
import Complex
import Control.Monad(when)
type Vc t s = Int -> Ptr t -> s
-- not yet admitted by my haddock version
-- infixr 5 :>
-- type t :> s = Vc t s
vec :: Vector t -> (Vc t s) -> s
vec v f = f (dim v) (ptr v)
baseOf v = (v `at` 0)
createVector :: Storable a => Int -> IO (Vector a)
createVector n = do
when (n <= 0) $ error ("trying to createVector of dim "++show n)
fp <- mallocForeignPtrArray n
let p = unsafeForeignPtrToPtr fp
--putStrLn ("\n---------> V"++show n)
return $ V n fp p
fromList :: Storable a => [a] -> Vector a
fromList l = unsafePerformIO $ do
v <- createVector (length l)
let f _ p = pokeArray p l >> return 0
f // vec v // check "fromList" []
return v
toList :: Storable a => Vector a -> [a]
toList v = unsafePerformIO $ peekArray (dim v) (ptr v)
n # l = if length l == n then fromList l else error "# with wrong size"
at' :: Storable a => Vector a -> Int -> a
at' v n = unsafePerformIO $ peekElemOff (ptr v) n
at :: Storable a => Vector a -> Int -> a
at v n | n >= 0 && n < dim v = at' v n
| otherwise = error "vector index out of range"
instance (Show a, Storable a) => (Show (Vector a)) where
show v = (show (dim v))++" # " ++ show (toList v)
-- | creates a Vector taking a number of consecutive toList from another Vector
subVector :: Storable t => Int -- ^ index of the starting element
-> Int -- ^ number of toList to extract
-> Vector t -- ^ source
-> Vector t -- ^ result
subVector k l (v@V {dim=n, ptr=p, fptr=fp})
| k<0 || k >= n || k+l > n || l < 0 = error "subVector out of range"
| otherwise = unsafePerformIO $ do
r <- createVector l
let f = copyArray (ptr r) (advancePtr p k) l >> return 0
f // check "subVector" [v]
return r
subVector' k l (v@V {dim=n, ptr=p, fptr=fp})
| k<0 || k >= n || k+l > n || l < 0 = error "subVector out of range"
| otherwise = v {dim=l, ptr=advancePtr p k}
-- | creates a new Vector by joining a list of Vectors
join :: Field t => [Vector t] -> Vector t
join [] = error "joining zero vectors"
join as = unsafePerformIO $ do
let tot = sum (map dim as)
r@V {fptr = p, ptr = p'} <- createVector tot
withForeignPtr p $ \_ ->
joiner as tot p'
return r
where joiner [] _ _ = return ()
joiner (V {dim = n, fptr = b, ptr = q} : cs) _ p = do
withForeignPtr b $ \_ -> copyArray p q n
joiner cs 0 (advancePtr p n)
-- | transforms a complex vector into a real vector with alternating real and imaginary parts
asReal :: Vector (Complex Double) -> Vector Double
asReal v = V { dim = 2*dim v, fptr = castForeignPtr (fptr v), ptr = castPtr (ptr v) }
-- | transforms a real vector into a complex vector with alternating real and imaginary parts
asComplex :: Vector Double -> Vector (Complex Double)
asComplex v = V { dim = dim v `div` 2, fptr = castForeignPtr (fptr v), ptr = castPtr (ptr v) }
constantG x n = fromList (replicate n x)
constantR :: Double -> Int -> Vector Double
constantR = constantAux cconstantR
constantC :: Complex Double -> Int -> Vector (Complex Double)
constantC = constantAux cconstantC
constantAux fun x n = unsafePerformIO $ do
v <- createVector n
px <- newArray [x]
fun px // vec v // check "constantAux" []
free px
return v
foreign import ccall safe "aux.h constantR"
cconstantR :: Ptr Double -> TV -- Double :> IO Int
foreign import ccall safe "aux.h constantC"
cconstantC :: Ptr (Complex Double) -> TCV -- Complex Double :> IO Int
constant :: Field a => a -> Int -> Vector a
constant x n | isReal id x = scast $ constantR (scast x) n
| isComp id x = scast $ constantC (scast x) n
| otherwise = constantG x n
|
