add examples

1 files changed, 32 insertions, 0 deletions

diff --git a/examples/listlike.hs b/examples/listlike.hs
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+++ b/examples/listlike.hs
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+{-# OPTIONS_GHC -fglasgow-exts #-}
+
+import qualified Data.ListLike as LL
+import LinearAlgebra
+import Data.Monoid
+import Data.Packed.Internal.Vector
+import Foreign
+
+instance (Storable a) => Monoid (Vector a) where
+    mempty = V { dim = 0, fptr = undefined, ptr = undefined }
+    mappend a b = mconcat [a,b]
+    mconcat = j . filter ((>0).dim)
+        where j [] = mempty
+              j l  = join l
+
+instance Storable a => LL.FoldableLL (Vector a) a where
+    foldl f x v = foldl f x (toList v)
+    foldr f x v = foldr f x (toList v)
+
+instance Storable a => LL.ListLike (Vector a) a where
+    singleton a = fromList [a]
+    head a = a @> 0
+    tail a | dim a == 1 = mempty
+           | otherwise  = subVector 1 (dim a -1) a
+    genericLength = fromIntegral.dim
+
+
+v k = fromList [1..k] :: Vector Double
+
+f k = k+(3::Double)
+
+main = print $ (LL.map f [1..5] :: Vector Double)
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