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diff --git a/lib/Data/Packed.hs b/lib/Data/Packed.hs
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+{-# OPTIONS_GHC -fglasgow-exts #-}
+-----------------------------------------------------------------------------
+{- |
+Module      :  Data.Packed
+Copyright   :  (c) Alberto Ruiz 2006-7
+License     :  GPL-style
+
+Maintainer  :  Alberto Ruiz (aruiz at um dot es)
+Stability   :  provisional
+Portability :  uses ffi
+
+The Vector and Matrix types and some utilities.
+
+-}
+-----------------------------------------------------------------------------
+
+module Data.Packed (
+    module Data.Packed.Vector,
+    module Data.Packed.Matrix,
+    module Data.Complex,
+    Container(..)
+) where
+
+import Data.Packed.Vector
+import Data.Packed.Matrix
+import Data.Complex
+import Data.Packed.Internal
+
+-- | conversion utilities
+class (Field e) => Container c e where
+    toComplex   :: RealFloat e => (c e, c e) -> c (Complex e)
+    fromComplex :: RealFloat e => c (Complex e) -> (c e, c e)
+    comp        :: RealFloat e => c e -> c (Complex e)
+    conj        :: RealFloat e => c (Complex e) -> c (Complex e)
+    real        :: c Double -> c e
+    complex     :: c e -> c (Complex Double)
+
+instance Container Vector Double where
+    toComplex = Data.Packed.Internal.toComplex
+    fromComplex = Data.Packed.Internal.fromComplex
+    comp = Data.Packed.Internal.comp
+    conj = Data.Packed.Internal.conj
+    real = id
+    complex = Data.Packed.comp
+
+instance Container Vector (Complex Double) where
+    toComplex = undefined -- can't match
+    fromComplex = undefined
+    comp = undefined
+    conj = undefined
+    real = Data.Packed.comp
+    complex = id
+
+instance Container Matrix Double where
+    toComplex = uncurry $ liftMatrix2 $ curry Data.Packed.toComplex
+    fromComplex z = (reshape c r, reshape c i)
+        where (r,i) = Data.Packed.fromComplex (cdat z)
+              c = cols z
+    comp = liftMatrix Data.Packed.Internal.comp
+    conj = liftMatrix Data.Packed.Internal.conj
+    real = id
+    complex = Data.Packed.comp
+
+instance Container Matrix (Complex Double) where
+    toComplex = undefined
+    fromComplex = undefined
+    comp = undefined
+    conj = undefined
+    real = Data.Packed.comp
+    complex = id