From cfd75ac234ef7d769f8a6f86949a18ee5f37fa00 Mon Sep 17 00:00:00 2001
From: Alberto Ruiz <aruiz@um.es>
Date: Thu, 5 Jun 2008 12:04:40 +0000
Subject: first version of Data.Packed.ST

---
 lib/Data/Packed/Convert.hs | 61 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 52 insertions(+), 9 deletions(-)

(limited to 'lib/Data/Packed')

diff --git a/lib/Data/Packed/Convert.hs b/lib/Data/Packed/Convert.hs
index 55fdf8f..206fa06 100644
--- a/lib/Data/Packed/Convert.hs
+++ b/lib/Data/Packed/Convert.hs
@@ -1,3 +1,5 @@
+{-# OPTIONS -XTypeOperators -XRank2Types  -XFlexibleContexts #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Data.Packed.Convert
@@ -9,18 +11,26 @@
 -- Portability :  portable
 --
 -- Conversion of Vectors and Matrices to and from the standard Haskell arrays.
+-- (provisional)
 --
 -----------------------------------------------------------------------------
 
 module Data.Packed.Convert (
-    vectorToStorableArray,
-    storableArrayToVector,
---    unsafeUpdateVector,
+    arrayFromVector, vectorFromArray,
+    mArrayFromVector, vectorFromMArray,
+    vectorToStorableArray, storableArrayToVector,
+    arrayFromMatrix, matrixFromArray,
+    mArrayFromMatrix, matrixFromMArray,
+--    matrixToStorableArray, storableArrayToMatrix
 ) where
 
 import Data.Packed.Internal
 import Data.Array.Storable
 import Foreign
+import Control.Monad.ST
+import Data.Array.ST
+import Data.Array.IArray
+import Data.Array.Unboxed
 
 -- | Creates a StorableArray indexed from 0 to dim -1.
 --   (Memory is efficiently copied, so you can then freely modify the obtained array)
@@ -49,11 +59,44 @@ unsafeVectorToStorableArray v = unsafeForeignPtrToStorableArray (fptr v) (0,dim
 --unsafeStorableArrayToVector s = undefined -- the foreign ptr of Storable Array is not available?
 
 -----------------------------------------------------------------
+-- provisional, we need Unboxed arrays for Complex Double
+
+
+unsafeFreeze' :: (MArray a e m, Ix i) => a i e -> m (Array i e)
+unsafeFreeze' = unsafeFreeze
+
+-- | creates an immutable Array from an hmatrix Vector (to do: unboxed)
+arrayFromVector :: (Storable t) => Vector t -> Array Int t
+arrayFromVector x = runSTArray (mArrayFromVector x)
+
+-- | creates a mutable array from an hmatrix Vector (to do: unboxed)
+mArrayFromVector :: (MArray b t (ST s), Storable t) => Vector t -> ST s (b Int t)
+mArrayFromVector v = unsafeThaw =<< unsafeIOToST ( unsafeFreeze' =<< (vectorToStorableArray $ v))
+
+
+-- (creates an hmatrix Vector from an immutable array (to do: unboxed))
+vectorFromArray :: (Storable t) => Array Int t -> Vector t
+vectorFromArray a = unsafePerformIO $ storableArrayToVector =<< unsafeThaw a
+
+-- | creates a mutable Array from an hmatrix Vector for manipulation with runSTUArray (to do: unboxed)
+vectorFromMArray :: (Storable t, MArray a t (ST s)) => a Int t -> ST s (Vector t)
+vectorFromMArray x = fmap vectorFromArray (unsafeFreeze' x)
+
+--------------------------------------------------------------------
+-- provisional
+
+matrixFromArray :: UArray (Int, Int) Double -> Matrix Double
+matrixFromArray m = reshape c . fromList . elems $ m
+    where ((r1,c1),(r2,c2)) = bounds m
+          r = r2-r1+1
+          c = c2-c1+1
+
+arrayFromMatrix :: Matrix Double -> UArray (Int, Int) Double
+arrayFromMatrix m = listArray ((0,0),(rows m -1, cols m -1)) (toList $ flatten m)
+
 
+mArrayFromMatrix :: (MArray b Double m) => Matrix Double -> m (b (Int, Int) Double)
+mArrayFromMatrix = unsafeThaw . arrayFromMatrix
 
-unsafeUpdateVector :: Storable t => Int -- ^ position
-                           -> (t->t)    -- ^ modification function
-                           -> Vector t  -- ^ source
-                           -> IO ()     -- ^ result
-unsafeUpdateVector k h v = do
-    withForeignPtr (fptr v) $ \s -> pokeElemOff s k (h (v`at'`k))
+matrixFromMArray :: (MArray a Double (ST s)) => a (Int,Int) Double -> ST s (Matrix Double)
+matrixFromMArray x = fmap matrixFromArray (unsafeFreeze x)
-- 
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