X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FLinear%2FVector.hs;h=aa1568bec6c2ff3b8ed0baa724177349fb04e3bb;hb=1f64a1a33b2636ef2e863a0b577c8d8d50233580;hp=aba9e5fb2d28d3d5ae43665ca95353f3cc8b6fd5;hpb=2f54e89d36e835c58efcc281741632d457859b20;p=numerical-analysis.git

diff --git a/src/Linear/Vector.hs b/src/Linear/Vector.hs
index aba9e5f..aa1568b 100644
--- a/src/Linear/Vector.hs
+++ b/src/Linear/Vector.hs
@@ -9,58 +9,30 @@ where
 
 import Data.Vector.Fixed (
   Dim,
-  Fun(..),
   N1,
-  N2,
-  N3,
   N4,
+  N5,
+  S,
   Vector(..),
-  construct,
-  inspect,
+  fromList,
   toList,
   )
 import qualified Data.Vector.Fixed as V (
   length,
   )
+import Data.Vector.Fixed.Boxed
 
-
--- * Low-dimension vector wrappers.
---
--- These wrappers are instances of 'Vector', so they inherit all of
--- the userful instances defined above. But, they use fixed
--- constructors, so you can pattern match out the individual
--- components.
-
-data D1 a = D1 a
-type instance Dim D1 = N1
-instance Vector D1 a where
-  inspect (D1 x) (Fun f) = f x
-  construct = Fun D1
-
-data D2 a = D2 a a
-type instance Dim D2 = N2
-instance Vector D2 a where
-  inspect (D2 x y) (Fun f) = f x y
-  construct = Fun D2
-
-data D3 a = D3 a a a
-type instance Dim D3 = N3
-instance Vector D3 a where
-  inspect (D3 x y z) (Fun f) = f x y z
-  construct = Fun D3
-
-data D4 a = D4 a a a a
-type instance Dim D4 = N4
-instance Vector D4 a where
-  inspect (D4 w x y z) (Fun f) = f w x y z
-  construct = Fun D4
+type Vec1 = Vec N1
+type Vec4 = Vec N4
+type Vec5 = Vec N5
 
 
 -- | Unsafe indexing.
 --
 --   Examples:
 --
---   >>> let v1 = D2 1 2
+--   >>> import Data.Vector.Fixed (mk2)
+--   >>> let v1 = mk2 1 2 :: Vec2 Int
 --   >>> v1 ! 1
 --   2
 --
@@ -71,7 +43,8 @@ instance Vector D4 a where
 --
 --   Examples:
 --
---   >>> let v1 = D3 1 2 3
+--   >>> import Data.Vector.Fixed (mk3)
+--   >>> let v1 = mk3 1 2 3 :: Vec3 Int
 --   >>> v1 !? 2
 --   Just 3
 --   >>> v1 !? 3
@@ -81,3 +54,20 @@ instance Vector D4 a where
 (!?) v1 idx
   | idx < 0 || idx >= V.length v1 = Nothing
   | otherwise                     = Just $ v1 ! idx
+
+
+-- | Remove an element of the given vector.
+--
+--   Examples:
+--
+--   >>> import Data.Vector.Fixed (mk3)
+--   >>> let b = mk3 1 2 3 :: Vec3 Int
+--   >>> delete b 1 :: Vec2 Int
+--   fromList [1,3]
+--
+delete :: (Vector v a, Vector w a, Dim v ~ S (Dim w)) => v a -> Int -> w a
+delete v1 idx =
+  fromList $ (lhalf ++ rhalf')
+  where
+    (lhalf, rhalf) = splitAt idx (toList v1)
+    rhalf' = tail rhalf