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|
{-# OPTIONS_GHC -fglasgow-exts #-}
-----------------------------------------------------------------------------
{- |
Module : LinearAlgebra.Linear
Copyright : (c) Alberto Ruiz 2006-7
License : GPL-style
Maintainer : Alberto Ruiz (aruiz at um dot es)
Stability : provisional
Portability : uses ffi
Basic optimized operations on vectors and matrices.
-}
-----------------------------------------------------------------------------
module LinearAlgebra.Linear (
Linear(..),
multiply, dot, outer
) where
import Data.Packed.Internal
import Data.Packed
import GSL.Vector
import Complex
-- | basic optimized operations
class (Container c e) => Linear c e where
scale :: e -> c e -> c e
addConstant :: e -> c e -> c e
add :: c e -> c e -> c e
sub :: c e -> c e -> c e
-- | element by element multiplication
mul :: c e -> c e -> c e
-- | element by element division
divide :: c e -> c e -> c e
-- | scale the element by element reciprocal of the object: @scaleRecip 2 (fromList [5,i]) == 2 |> [0.4 :+ 0.0,0.0 :+ (-2.0)]@
scaleRecip :: e -> c e -> c e
instance Linear Vector Double where
scale = vectorMapValR Scale
scaleRecip = vectorMapValR Recip
addConstant = vectorMapValR AddConstant
add = vectorZipR Add
sub = vectorZipR Sub
mul = vectorZipR Mul
divide = vectorZipR Div
instance Linear Vector (Complex Double) where
scale = vectorMapValC Scale
scaleRecip = vectorMapValC Recip
addConstant = vectorMapValC AddConstant
add = vectorZipC Add
sub = vectorZipC Sub
mul = vectorZipC Mul
divide = vectorZipC Div
instance Linear Matrix Double where
scale x = liftMatrix (scale x)
scaleRecip x = liftMatrix (scaleRecip x)
addConstant x = liftMatrix (addConstant x)
add = liftMatrix2 add
sub = liftMatrix2 sub
mul = liftMatrix2 mul
divide = liftMatrix2 divide
instance Linear Matrix (Complex Double) where
scale x = liftMatrix (scale x)
scaleRecip x = liftMatrix (scaleRecip x)
addConstant x = liftMatrix (addConstant x)
add = liftMatrix2 add
sub = liftMatrix2 sub
mul = liftMatrix2 mul
divide = liftMatrix2 divide
--------------------------------------------------
-- | euclidean inner product
dot :: (Field t) => Vector t -> Vector t -> t
dot u v = dat (multiply r c) `at` 0
where r = asRow u
c = asColumn v
{- | Outer product of two vectors.
@\> 'fromList' [1,2,3] \`outer\` 'fromList' [5,2,3]
(3><3)
[ 5.0, 2.0, 3.0
, 10.0, 4.0, 6.0
, 15.0, 6.0, 9.0 ]@
-}
outer :: (Field t) => Vector t -> Vector t -> Matrix t
outer u v = asColumn u `multiply` asRow v
|
