5 files changed, 17 insertions, 8 deletions

diff --git a/lib/Numeric/LinearAlgebra/Algorithms.hs b/lib/Numeric/LinearAlgebra/Algorithms.hs
index 7de9587..55398e0 100644
--- a/lib/Numeric/LinearAlgebra/Algorithms.hs
+++ b/lib/Numeric/LinearAlgebra/Algorithms.hs
@@ -76,8 +76,10 @@ module Numeric.LinearAlgebra.Algorithms (
 ) where
 
 
-import Data.Packed.Internal hiding (fromComplex, toComplex, conj, (//))
-import Data.Packed
+import Data.Packed.Internal hiding ((//))
+import Data.Packed.Vector
+import Data.Packed.Matrix
+import Data.Complex
 import Numeric.GSL.Vector
 import Numeric.LinearAlgebra.LAPACK as LAPACK
 import Numeric.LinearAlgebra.Linear
diff --git a/lib/Numeric/LinearAlgebra/Interface.hs b/lib/Numeric/LinearAlgebra/Interface.hs
index 750670b..30547d9 100644
--- a/lib/Numeric/LinearAlgebra/Interface.hs
+++ b/lib/Numeric/LinearAlgebra/Interface.hs
@@ -9,9 +9,7 @@ Maintainer  :  Alberto Ruiz (aruiz at um dot es)
 Stability   :  provisional
 Portability :  portable
 
-Operators for frequent operations.
-
-This module exports Show, Read, Eq, Num, Fractional, and Floating instances for Vector and Matrix.
+Some useful operators, and Show, Read, Eq, Num, Fractional, and Floating instances for Vector and Matrix.
 
 In the context of the standard numeric operators, one-component vectors and matrices automatically expand to match the dimensions of the other operand.
 
diff --git a/lib/Numeric/LinearAlgebra/LAPACK.hs b/lib/Numeric/LinearAlgebra/LAPACK.hs
index f5af8be..7f057ba 100644
--- a/lib/Numeric/LinearAlgebra/LAPACK.hs
+++ b/lib/Numeric/LinearAlgebra/LAPACK.hs
@@ -41,8 +41,9 @@ module Numeric.LinearAlgebra.LAPACK (
     schurR, schurC
 ) where
 
-import Data.Packed.Internal hiding (toComplex)
-import Data.Packed
+import Data.Packed.Internal
+import Data.Packed.Matrix
+import Data.Complex
 import Numeric.GSL.Vector(vectorMapValR, FunCodeSV(Scale))
 import Foreign
 import Foreign.C.Types (CInt)
diff --git a/lib/Numeric/LinearAlgebra/Linear.hs b/lib/Numeric/LinearAlgebra/Linear.hs
index 2568410..c802712 100644
--- a/lib/Numeric/LinearAlgebra/Linear.hs
+++ b/lib/Numeric/LinearAlgebra/Linear.hs
@@ -18,7 +18,9 @@ module Numeric.LinearAlgebra.Linear (
     Linear(..)
 ) where
 
-import Data.Packed
+import Data.Packed.Vector
+import Data.Packed.Matrix
+import Data.Complex
 import Numeric.GSL.Vector
 
 -- | Basic element-by-element functions.
diff --git a/lib/Numeric/LinearAlgebra/Tests.hs b/lib/Numeric/LinearAlgebra/Tests.hs
index ac26466..65b0e4c 100644
--- a/lib/Numeric/LinearAlgebra/Tests.hs
+++ b/lib/Numeric/LinearAlgebra/Tests.hs
@@ -78,6 +78,11 @@ volSphere r = 8 * quad2 (\x y -> sqrt (r*r-x*x-y*y))
 
 ---------------------------------------------------------------------
 
+derivTest = abs (d (\x-> x * d (\y-> x+y) 1) 1 - 1) < 1E-10
+    where d f x = fst $ derivCentral 0.01 f x
+
+---------------------------------------------------------------------
+
 -- besselTest = utest "bessel_J0_e" ( abs (r-expected) < e )
 --     where (r,e) = bessel_J0_e 5.0
 --           expected = -0.17759677131433830434739701
@@ -319,6 +324,7 @@ runTests n = do
 --        , utest "gamma" (gamma 5 == 24.0)
 --        , besselTest
 --        , exponentialTest
+        , utest "deriv" derivTest
         , utest "integrate" (abs (volSphere 2.5 - 4/3*pi*2.5^3) < 1E-8)
         , utest "polySolve" (polySolveProp [1,2,3,4])
         , minimizationTest