3 files changed, 25 insertions, 7 deletions

diff --git a/lib/Numeric/LinearAlgebra/Instances.hs b/lib/Numeric/LinearAlgebra/Instances.hs
index 67496f2..b17da5a 100644
--- a/lib/Numeric/LinearAlgebra/Instances.hs
+++ b/lib/Numeric/LinearAlgebra/Instances.hs
@@ -25,7 +25,7 @@ import Data.Packed.Matrix
 import Complex
 import Data.List(transpose,intersperse)
 import Foreign(Storable)
-import Data.Monoid
+-- import Data.Monoid
 import Data.Packed.Internal.Vector
 -- import Control.Parallel.Strategies
 
@@ -182,12 +182,12 @@ instance (Linear Vector a, Floating (Vector a), Fractional (Matrix a)) => Floati
 
 ---------------------------------------------------------------
 
-instance (Storable a, Num (Vector a)) => Monoid (Vector a) where
-    mempty = 0 { idim = 0 }
-    mappend a b = mconcat [a,b]
-    mconcat = j . filter ((>0).dim)
-        where j [] = mempty
-              j l  = join l
+-- instance (Storable a, Num (Vector a)) => Monoid (Vector a) where
+--     mempty = 0 { idim = 0 }
+--     mappend a b = mconcat [a,b]
+--     mconcat = j . filter ((>0).dim)
+--         where j [] = mempty
+--               j l  = join l
 
 ---------------------------------------------------------------
 
diff --git a/lib/Numeric/LinearAlgebra/Tests.hs b/lib/Numeric/LinearAlgebra/Tests.hs
index 016b9a1..3f7c847 100644
--- a/lib/Numeric/LinearAlgebra/Tests.hs
+++ b/lib/Numeric/LinearAlgebra/Tests.hs
@@ -180,6 +180,9 @@ runTests n = do
     test (multProp1  . cConsist)
     test (multProp2  . rConsist)
     test (multProp2  . cConsist)
+    putStrLn "------ sub-trans"
+    test (subProp . rM)
+    test (subProp . cM)
     putStrLn "------ lu"
     test (luProp    . rM)
     test (luProp    . cM)
@@ -305,6 +308,7 @@ makeUnitary v | realPart n > 1    = v / scalar n
 -- | Performance measurements.
 runBenchmarks :: IO ()
 runBenchmarks = do
+    subBench
     multBench
     svdBench
     eigBench
@@ -335,6 +339,16 @@ multb n = foldl1' (<>) (replicate (10^6) (ident n :: Matrix Double))
 
 --------------------------------
 
+subBench = do
+    putStrLn ""
+    let g = foldl1' (.) (replicate (10^5) (\v -> subVector 1 (dim v -1) v))
+    time "0.1M subVector   " (g (constant 1 (1+10^5) :: Vector Double) @> 0)
+    let f = foldl1' (.) (replicate (10^5) (fromRows.toRows))
+    time "subVector-join  3" (f (ident  3 :: Matrix Double) @@>(0,0))
+    time "subVector-join 10" (f (ident 10 :: Matrix Double) @@>(0,0))
+
+--------------------------------
+
 multBench = do
     let a = ident 1000 :: Matrix Double
     let b = ident 2000 :: Matrix Double
diff --git a/lib/Numeric/LinearAlgebra/Tests/Properties.hs b/lib/Numeric/LinearAlgebra/Tests/Properties.hs
index 93175f2..6d176fa 100644
--- a/lib/Numeric/LinearAlgebra/Tests/Properties.hs
+++ b/lib/Numeric/LinearAlgebra/Tests/Properties.hs
@@ -38,6 +38,7 @@ module Numeric.LinearAlgebra.Tests.Properties (
     cholProp,
     expmDiagProp,
     multProp1, multProp2,
+    subProp,
     linearSolveProp, linearSolveProp2
 ) where
 
@@ -243,3 +244,6 @@ linearSolveProp2 f (a,x) = not wc `trivial` (not wc || a <> f a b |~| b)
     where q = min (rows a) (cols a)
           b = a <> x
           wc = rank a == q
+
+subProp m = m == (trans . fromColumns . toRows) m
+