1 files changed, 46 insertions, 6 deletions

diff --git a/packages/base/src/Data/Packed/Internal/Matrix.hs b/packages/base/src/Data/Packed/Internal/Matrix.hs
index 82a9d8f..ddeddae 100644
--- a/packages/base/src/Data/Packed/Internal/Matrix.hs
+++ b/packages/base/src/Data/Packed/Internal/Matrix.hs
@@ -105,6 +105,14 @@ cols = icols
 orderOf :: Matrix t -> MatrixOrder
 orderOf = order
 
+stepRow :: Matrix t -> CInt
+stepRow Matrix {icols = c, order = RowMajor } = fromIntegral c
+stepRow _                                     = 1
+
+stepCol :: Matrix t -> CInt
+stepCol Matrix {irows = r, order = ColumnMajor } = fromIntegral r
+stepCol _                                        = 1
+
 
 -- | Matrix transpose.
 trans :: Matrix t -> Matrix t
@@ -128,6 +136,14 @@ mat a f =
             g (fi (rows a)) (fi (cols a)) p
         f m
 
+omat :: (Storable t) => Matrix t -> (((CInt -> CInt -> CInt -> CInt -> Ptr t -> t1) -> t1) -> IO b) -> IO b
+omat a f =
+    unsafeWith (xdat a) $ \p -> do
+        let m g = do
+            g (fi (rows a)) (fi (cols a)) (stepRow a) (stepCol a) p
+        f m
+
+
 {- | Creates a vector by concatenation of rows. If the matrix is ColumnMajor, this operation requires a transpose.
 
 >>> flatten (ident 3)
@@ -257,7 +273,7 @@ compat m1 m2 = rows m1 == rows m2 && cols m1 == cols m2
     >instance Element Foo
 -}
 class (Storable a) => Element a where
-    subMatrixD :: (Int,Int) -- ^ (r0,c0) starting position 
+    subMatrixD :: (Int,Int) -- ^ (r0,c0) starting position
                -> (Int,Int) -- ^ (rt,ct) dimensions of submatrix
                -> Matrix a -> Matrix a
     subMatrixD = subMatrix'
@@ -270,6 +286,7 @@ class (Storable a) => Element a where
     sortV    :: Ord a => Vector a -> Vector a
     compareV :: Ord a => Vector a -> Vector a -> Vector CInt
     selectV  :: Vector CInt -> Vector a -> Vector a -> Vector a -> Vector a
+    remapM   :: Matrix CInt -> Matrix CInt -> Matrix a -> Matrix a
 
 
 instance Element Float where
@@ -280,7 +297,7 @@ instance Element Float where
     sortV      = sortValF
     compareV   = compareF
     selectV    = selectF
-    
+    remapM     = remapF
 
 instance Element Double where
     transdata  = transdataAux ctransR
@@ -290,6 +307,7 @@ instance Element Double where
     sortV      = sortValD
     compareV   = compareD
     selectV    = selectD
+    remapM     = remapD
 
 
 instance Element (Complex Float) where
@@ -300,6 +318,7 @@ instance Element (Complex Float) where
     sortV      = undefined
     compareV   = undefined
     selectV    = selectQ
+    remapM     = remapQ
 
 
 instance Element (Complex Double) where
@@ -310,8 +329,8 @@ instance Element (Complex Double) where
     sortV      = undefined
     compareV   = undefined
     selectV    = selectC
+    remapM     = remapC
 
-    
 instance Element (CInt) where
     transdata  = transdataAux ctransI
     constantD  = constantAux cconstantI
@@ -320,7 +339,7 @@ instance Element (CInt) where
     sortV      = sortValI
     compareV   = compareI
     selectV    = selectI
-
+    remapM     = remapI
 
 -------------------------------------------------------------------
 
@@ -394,7 +413,7 @@ foreign import ccall unsafe "constantP" cconstantP :: Ptr () -> CInt -> Ptr () -
 
 -- | Extracts a submatrix from a matrix.
 subMatrix :: Element a
-          => (Int,Int) -- ^ (r0,c0) starting position 
+          => (Int,Int) -- ^ (r0,c0) starting position
           -> (Int,Int) -- ^ (rt,ct) dimensions of submatrix
           -> Matrix a -- ^ input matrix
           -> Matrix a -- ^ result
@@ -427,7 +446,7 @@ conformMs ms = map (conformMTo (r,c)) ms
   where
     r = maxZ (map rows ms)
     c = maxZ (map cols ms)
-    
+
 
 conformVs vs = map (conformVTo n) vs
   where
@@ -554,4 +573,25 @@ foreign import ccall unsafe "chooseI" c_selectI :: Sel CInt
 foreign import ccall unsafe "chooseC" c_selectC :: Sel (Complex Double)
 foreign import ccall unsafe "chooseQ" c_selectQ :: Sel (Complex Float)
 
+---------------------------------------------------------------------------
+
+remapG f i j m = unsafePerformIO $ do
+    r <- createMatrix RowMajor (rows i) (cols i)
+    app4 f omat i omat j omat m omat r "remapG"
+    return r
+
+remapD = remapG c_remapD
+remapF = remapG c_remapF
+remapI = remapG c_remapI
+remapC = remapG c_remapC
+remapQ = remapG c_remapQ
+
+type Rem x = OM CInt (OM CInt (OM x (OM x (IO CInt))))
+
+foreign import ccall unsafe "remapD" c_remapD :: Rem Double
+foreign import ccall unsafe "remapF" c_remapF :: Rem Float
+foreign import ccall unsafe "remapI" c_remapI :: Rem CInt
+foreign import ccall unsafe "remapC" c_remapC :: Rem (Complex Double)
+foreign import ccall unsafe "remapQ" c_remapQ :: Rem (Complex Float)
+