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diff --git a/lib/Numeric/MatrixBoot.hs b/lib/Numeric/MatrixBoot.hs
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+{-# LANGUAGE FlexibleContexts #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Numeric.MatrixBoot
+-- Copyright   :  (c) Alberto Ruiz 2010
+-- License     :  GPL-style
+--
+-- Maintainer  :  Alberto Ruiz <aruiz@um.es>
+-- Stability   :  provisional
+-- Portability :  portable
+--
+-- Module to avoid cyclic dependency
+--
+-----------------------------------------------------------------------------
+
+module Numeric.MatrixBoot (
+                     ctrans, diag, ident,
+                    ) where
+
+import Data.Packed.Vector
+import Data.Packed.Matrix
+import Data.Packed.Internal.Matrix
+import Numeric.Container
+
+-------------------------------------------------------------------
+
+-- | conjugate transpose
+ctrans :: (Container Vector e, Element e) => Matrix e -> Matrix e
+ctrans = liftMatrix conj . trans
+
+-- | Creates a square matrix with a given diagonal.
+diag :: (Num a, Element a) => Vector a -> Matrix a
+diag v = diagRect 0 v n n where n = dim v
+
+-- | creates the identity matrix of given dimension
+ident :: (Num a, Element a) => Int -> Matrix a
+ident n = diag (constantD 1 n)
+
+----------------------------------------------------
+
+