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diff --git a/packages/base/src/Data/Packed/Internal/Sparse.hs b/packages/base/src/Data/Packed/Internal/Sparse.hs
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+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE FlexibleInstances #-}
+
+
+
+module Data.Packed.Internal.Sparse(
+    SMatrix(..),
+    mkCSR, mkDiag,
+    AssocMatrix,
+    toDense,
+    smXv
+)where
+
+import Numeric.Container
+import qualified Data.Vector.Storable as V
+import Data.Function(on)
+import Control.Arrow((***))
+import Control.Monad(when)
+import Data.List(groupBy, sort)
+import Foreign.C.Types(CInt(..))
+import Numeric.LinearAlgebra.Devel
+import System.IO.Unsafe(unsafePerformIO)
+import Foreign(Ptr)
+import Text.Printf(printf)
+
+infixl 0 ~!~
+c ~!~ msg = when c (error msg)
+
+type AssocMatrix = [((Int,Int),Double)]
+
+data SMatrix
+    = CSR
+        { csrVals :: Vector Double
+        , csrCols :: Vector CInt
+        , csrRows :: Vector CInt
+        , nRows   :: Int
+        , nCols   :: Int
+        }
+    | CSC
+        { cscVals :: Vector Double
+        , cscRows :: Vector CInt
+        , cscCols :: Vector CInt
+        , nRows   :: Int
+        , nCols   :: Int
+        }
+    | Diag
+        { diagVals :: Vector Double
+        , nRows   :: Int
+        , nCols   :: Int
+        }
+--    | Banded
+    deriving Show
+
+mkCSR :: AssocMatrix -> SMatrix
+mkCSR sm' = CSR{..}
+  where
+    sm = sort sm'
+    rws = map ((fromList *** fromList)
+              . unzip
+              . map ((succ.fi.snd) *** id)
+              )
+        . groupBy ((==) `on` (fst.fst))
+        $ sm
+    rszs = map (fi . dim . fst) rws
+    csrRows = fromList (scanl (+) 1 rszs)
+    csrVals = vjoin (map snd rws)
+    csrCols = vjoin (map fst rws)
+    nRows = dim csrRows - 1
+    nCols = fromIntegral (V.maximum csrCols)
+
+
+mkDiagR r c v
+    | dim v <= min r c = Diag{..}
+    | otherwise = error $ printf "mkDiagR: incorrect sizes (%d,%d) [%d]" r c (dim v)
+  where
+    nRows = r
+    nCols = c
+    diagVals = v
+
+mkDiag v = mkDiagR (dim v) (dim v) v
+
+
+type IV t = CInt -> Ptr CInt   -> t
+type  V t = CInt -> Ptr Double -> t
+type SMxV = V (IV (IV (V (V (IO CInt)))))
+
+smXv :: SMatrix -> Vector Double -> Vector Double
+smXv CSR{..} v = unsafePerformIO $ do
+    dim v /= nCols ~!~ printf "smXv (CSR): incorrect sizes: (%d,%d) x %d" nRows nCols (dim v)
+    r <- createVector nRows
+    app5 c_smXv vec csrVals vec csrCols vec csrRows vec v vec r "CSRXv"
+    return r
+
+smXv CSC{..} v = unsafePerformIO $ do
+    dim v /= nCols ~!~ printf "smXv (CSC): incorrect sizes: (%d,%d) x %d" nRows nCols (dim v)
+    r <- createVector nRows
+    app5 c_smTXv vec cscVals vec cscRows vec cscCols vec v vec r "CSCXv"
+    return r
+
+smXv Diag{..} v
+    | dim v == nCols
+        = vjoin [ subVector 0 (dim diagVals) v `mul` diagVals
+                , konst 0 (nRows - dim diagVals) ]
+    | otherwise = error $ printf "smXv (Diag): incorrect sizes: (%d,%d) [%d] x %d"
+                                 nRows nCols (dim diagVals) (dim v)
+
+
+instance Contraction SMatrix (Vector Double) (Vector Double)
+  where
+    contraction = smXv
+
+--------------------------------------------------------------------------------
+
+foreign import ccall unsafe "smXv"
+  c_smXv :: SMxV
+
+foreign import ccall unsafe "smTXv"
+  c_smTXv :: SMxV
+
+--------------------------------------------------------------------------------
+
+toDense :: AssocMatrix -> Matrix Double
+toDense asm = assoc (r+1,c+1) 0 asm
+  where
+    (r,c) = (maximum *** maximum) . unzip . map fst $ asm
+
+
+
+instance Transposable (SMatrix)
+  where
+    tr (CSR vs cs rs n m) = CSC vs cs rs m n
+    tr (CSC vs rs cs n m) = CSR vs rs cs m n
+    tr (Diag v n m) = Diag v m n
+
+instance Transposable (Matrix Double)
+  where
+    tr = trans
+
+
+
+--------------------------------------------------------------------------------
+
+instance Testable SMatrix
+  where
+    checkT _ = (ok,info)
+      where
+        sma = convo2 20 3
+        x1 = vect [1..20]
+        x2 = vect [1..40]
+        sm = mkCSR sma
+
+        s1 = sm ◇ x1
+        d1 = toDense sma  ◇  x1
+
+        s2 = tr sm  ◇  x2
+        d2 = tr (toDense sma) ◇  x2
+
+        sdia = mkDiagR 40 20 (vect [1..10])
+        s3 =    sdia  ◇  x1
+        s4 = tr sdia  ◇  x2
+        ddia = diagRect 0 (vect [1..10])  40 20
+        d3 = ddia  ◇  x1
+        d4 = tr ddia  ◇  x2
+
+        info = do
+            print sm
+            disp (toDense sma)
+            print s1; print d1
+            print s2; print d2
+            print s3; print d3
+            print s4; print d4
+
+        ok = s1==d1
+          && s2==d2
+          && s3==d3
+          && s4==d4
+
+        disp = putStr . dispf 2
+
+        vect = fromList :: [Double] -> Vector Double
+
+        convomat :: Int -> Int -> AssocMatrix
+        convomat n k = [ ((i,j `mod` n),1) | i<-[0..n-1], j <- [i..i+k-1]]
+
+        convo2 :: Int -> Int -> AssocMatrix
+        convo2 n k = m1 ++ m2
+          where
+            m1 = convomat n k
+            m2 = map (((+n) *** id) *** id) m1
+