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diff --git a/lib/LinearAlgebra/Linear.hs b/lib/LinearAlgebra/Linear.hs
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+{-# OPTIONS_GHC -fglasgow-exts #-}
+-----------------------------------------------------------------------------
+{- |
+Module      :  LinearAlgebra.Linear
+Copyright   :  (c) Alberto Ruiz 2006-7
+License     :  GPL-style
+
+Maintainer  :  Alberto Ruiz (aruiz at um dot es)
+Stability   :  provisional
+Portability :  uses ffi
+
+
+-}
+-----------------------------------------------------------------------------
+
+module LinearAlgebra.Linear (
+    Linear(..)
+) where
+
+
+import Data.Packed.Internal
+import GSL.Vector
+import Complex
+
+
+class (Num e, Field e) => Linear c e where
+    scale       :: e -> c e -> c e
+    addConstant :: e -> c e -> c e
+    add         :: c e -> c e -> c e
+    sub         :: c e -> c e -> c e
+    mul         :: c e -> c e -> c e
+
+instance Linear Vector Double where
+    scale = vectorMapValR Scale
+    addConstant = vectorMapValR AddConstant
+    add = vectorZipR Add
+    sub = vectorZipR Sub
+    mul = vectorZipR Mul
+
+instance Linear Vector (Complex Double) where
+    scale = vectorMapValC Scale
+    addConstant = vectorMapValC AddConstant
+    add = vectorZipC Add
+    sub = vectorZipC Sub
+    mul = vectorZipC Mul