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|
{-# LANGUAGE UndecidableInstances, FlexibleInstances #-}
-----------------------------------------------------------------------------
{- |
Module : Numeric.LinearAlgebra.Instances
Copyright : (c) Alberto Ruiz 2006
License : GPL-style
Maintainer : Alberto Ruiz (aruiz at um dot es)
Stability : provisional
Portability : portable
This module exports 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.
-}
-----------------------------------------------------------------------------
module Numeric.LinearAlgebra.Instances(
) where
import Numeric.LinearAlgebra.Linear
import Numeric.GSL.Vector
import Data.Packed.Matrix
import Data.Complex
import Data.List(transpose,intersperse)
import Data.Packed.Internal.Vector
#ifndef VECTOR
import Foreign(Storable)
#endif
------------------------------------------------------------------
instance (Show a, Element a) => (Show (Matrix a)) where
show m = (sizes++) . dsp . map (map show) . toLists $ m
where sizes = "("++show (rows m)++"><"++show (cols m)++")\n"
dsp as = (++" ]") . (" ["++) . init . drop 2 . unlines . map (" , "++) . map unwords' $ transpose mtp
where
mt = transpose as
longs = map (maximum . map length) mt
mtp = zipWith (\a b -> map (pad a) b) longs mt
pad n str = replicate (n - length str) ' ' ++ str
unwords' = concat . intersperse ", "
#ifndef VECTOR
instance (Show a, Storable a) => (Show (Vector a)) where
show v = (show (dim v))++" |> " ++ show (toList v)
#endif
------------------------------------------------------------------
instance (Element a, Read a) => Read (Matrix a) where
readsPrec _ s = [((rs><cs) . read $ listnums, rest)]
where (thing,rest) = breakAt ']' s
(dims,listnums) = breakAt ')' thing
cs = read . init . fst. breakAt ')' . snd . breakAt '<' $ dims
rs = read . snd . breakAt '(' .init . fst . breakAt '>' $ dims
#ifdef VECTOR
instance (Element a, Read a) => Read (Vector a) where
readsPrec _ s = [(fromList . read $ listnums, rest)]
where (thing,trest) = breakAt ']' s
(dims,listnums) = breakAt ' ' (dropWhile (==' ') thing)
rest = drop 31 trest
#else
instance (Element a, Read a) => Read (Vector a) where
readsPrec _ s = [((d |>) . read $ listnums, rest)]
where (thing,rest) = breakAt ']' s
(dims,listnums) = breakAt '>' thing
d = read . init . fst . breakAt '|' $ dims
#endif
breakAt c l = (a++[c],tail b) where
(a,b) = break (==c) l
------------------------------------------------------------------
adaptScalar f1 f2 f3 x y
| dim x == 1 = f1 (x@>0) y
| dim y == 1 = f3 x (y@>0)
| otherwise = f2 x y
#ifndef VECTOR
instance Linear Vector a => Eq (Vector a) where
(==) = equal
#endif
instance Num (Vector Double) where
(+) = adaptScalar addConstant add (flip addConstant)
negate = scale (-1)
(*) = adaptScalar scale mul (flip scale)
signum = vectorMapR Sign
abs = vectorMapR Abs
fromInteger = fromList . return . fromInteger
instance Num (Vector (Complex Double)) where
(+) = adaptScalar addConstant add (flip addConstant)
negate = scale (-1)
(*) = adaptScalar scale mul (flip scale)
signum = vectorMapC Sign
abs = vectorMapC Abs
fromInteger = fromList . return . fromInteger
instance Linear Matrix a => Eq (Matrix a) where
(==) = equal
instance (Linear Matrix a, Num (Vector a)) => Num (Matrix a) where
(+) = liftMatrix2Auto (+)
(-) = liftMatrix2Auto (-)
negate = liftMatrix negate
(*) = liftMatrix2Auto (*)
signum = liftMatrix signum
abs = liftMatrix abs
fromInteger = (1><1) . return . fromInteger
---------------------------------------------------
instance (Linear Vector a, Num (Vector a)) => Fractional (Vector a) where
fromRational n = fromList [fromRational n]
(/) = adaptScalar f divide g where
r `f` v = scaleRecip r v
v `g` r = scale (recip r) v
-------------------------------------------------------
instance (Linear Vector a, Fractional (Vector a), Num (Matrix a)) => Fractional (Matrix a) where
fromRational n = (1><1) [fromRational n]
(/) = liftMatrix2Auto (/)
---------------------------------------------------------
instance Floating (Vector Double) where
sin = vectorMapR Sin
cos = vectorMapR Cos
tan = vectorMapR Tan
asin = vectorMapR ASin
acos = vectorMapR ACos
atan = vectorMapR ATan
sinh = vectorMapR Sinh
cosh = vectorMapR Cosh
tanh = vectorMapR Tanh
asinh = vectorMapR ASinh
acosh = vectorMapR ACosh
atanh = vectorMapR ATanh
exp = vectorMapR Exp
log = vectorMapR Log
sqrt = vectorMapR Sqrt
(**) = adaptScalar (vectorMapValR PowSV) (vectorZipR Pow) (flip (vectorMapValR PowVS))
pi = fromList [pi]
-------------------------------------------------------------
instance Floating (Vector (Complex Double)) where
sin = vectorMapC Sin
cos = vectorMapC Cos
tan = vectorMapC Tan
asin = vectorMapC ASin
acos = vectorMapC ACos
atan = vectorMapC ATan
sinh = vectorMapC Sinh
cosh = vectorMapC Cosh
tanh = vectorMapC Tanh
asinh = vectorMapC ASinh
acosh = vectorMapC ACosh
atanh = vectorMapC ATanh
exp = vectorMapC Exp
log = vectorMapC Log
sqrt = vectorMapC Sqrt
(**) = adaptScalar (vectorMapValC PowSV) (vectorZipC Pow) (flip (vectorMapValC PowVS))
pi = fromList [pi]
-----------------------------------------------------------
instance (Linear Vector a, Floating (Vector a), Fractional (Matrix a)) => Floating (Matrix a) where
sin = liftMatrix sin
cos = liftMatrix cos
tan = liftMatrix tan
asin = liftMatrix asin
acos = liftMatrix acos
atan = liftMatrix atan
sinh = liftMatrix sinh
cosh = liftMatrix cosh
tanh = liftMatrix tanh
asinh = liftMatrix asinh
acosh = liftMatrix acosh
atanh = liftMatrix atanh
exp = liftMatrix exp
log = liftMatrix log
(**) = liftMatrix2Auto (**)
sqrt = liftMatrix sqrt
pi = (1><1) [pi]
---------------------------------------------------------------
-- 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 (NFData a, Storable a) => NFData (Vector a) where
-- rnf = rnf . (@>0)
--
-- instance (NFData a, Element a) => NFData (Matrix a) where
-- rnf = rnf . flatten
|
