----------------------------------------------------------------------------- -- | -- Module : Data.Packed.Matrix -- Copyright : (c) Alberto Ruiz 2007 -- License : GPL-style -- -- Maintainer : Alberto Ruiz -- Stability : provisional -- Portability : portable -- -- A Matrix representation suitable for numerical computations using LAPACK and GSL. -- ----------------------------------------------------------------------------- module Data.Packed.Matrix ( Element, Matrix,rows,cols, (><), trans, reshape, flatten, fromLists, toLists, buildMatrix, (@@>), asRow, asColumn, fromRows, toRows, fromColumns, toColumns, fromBlocks, repmat, flipud, fliprl, subMatrix, takeRows, dropRows, takeColumns, dropColumns, extractRows, ident, diag, diagRect, takeDiag, liftMatrix, liftMatrix2, format, dispf, disps, loadMatrix, saveMatrix, fromFile, fileDimensions, readMatrix, fromArray2D ) where import Data.Packed.Internal import qualified Data.Packed.ST as ST import Data.Packed.Vector import Data.List(transpose,intersperse) import Data.Array import System.Process(readProcess) import Text.Printf(printf) -- | creates a matrix from a vertical list of matrices joinVert :: Element t => [Matrix t] -> Matrix t joinVert ms = case common cols ms of Nothing -> error "joinVert on matrices with different number of columns" Just c -> reshape c $ join (map flatten ms) -- | creates a matrix from a horizontal list of matrices joinHoriz :: Element t => [Matrix t] -> Matrix t joinHoriz ms = trans. joinVert . map trans $ ms {- | Creates a matrix from blocks given as a list of lists of matrices: @\> let a = 'diag' $ 'fromList' [5,7,2] \> let b = 'reshape' 4 $ 'constant' (-1) 12 \> fromBlocks [[a,b],[b,a]] (6><7) [ 5.0, 0.0, 0.0, -1.0, -1.0, -1.0, -1.0 , 0.0, 7.0, 0.0, -1.0, -1.0, -1.0, -1.0 , 0.0, 0.0, 2.0, -1.0, -1.0, -1.0, -1.0 , -1.0, -1.0, -1.0, -1.0, 5.0, 0.0, 0.0 , -1.0, -1.0, -1.0, -1.0, 0.0, 7.0, 0.0 , -1.0, -1.0, -1.0, -1.0, 0.0, 0.0, 2.0 ]@ -} fromBlocks :: Element t => [[Matrix t]] -> Matrix t fromBlocks = joinVert . map joinHoriz -- | Reverse rows flipud :: Element t => Matrix t -> Matrix t flipud m = fromRows . reverse . toRows $ m -- | Reverse columns fliprl :: Element t => Matrix t -> Matrix t fliprl m = fromColumns . reverse . toColumns $ m ------------------------------------------------------------ -- | Creates a square matrix with a given diagonal. diag :: Element a => Vector a -> Matrix a diag v = ST.runSTMatrix $ do let d = dim v m <- ST.newMatrix 0 d d mapM_ (\k -> ST.writeMatrix m k k (v@>k)) [0..d-1] return m {- | creates a rectangular diagonal matrix @> diagRect (constant 5 3) 3 4 :: Matrix Double (3><4) [ 5.0, 0.0, 0.0, 0.0 , 0.0, 5.0, 0.0, 0.0 , 0.0, 0.0, 5.0, 0.0 ]@ -} diagRect :: (Element t, Num t) => Vector t -> Int -> Int -> Matrix t diagRect v r c | dim v < min r c = error "diagRect called with dim v < min r c" | otherwise = ST.runSTMatrix $ do m <- ST.newMatrix 0 r c let d = min r c mapM_ (\k -> ST.writeMatrix m k k (v@>k)) [0..d-1] return m -- | extracts the diagonal from a rectangular matrix takeDiag :: (Element t) => Matrix t -> Vector t takeDiag m = fromList [flatten m `at` (k*cols m+k) | k <- [0 .. min (rows m) (cols m) -1]] -- | creates the identity matrix of given dimension ident :: Element a => Int -> Matrix a ident n = diag (constant 1 n) ------------------------------------------------------------ {- | An easy way to create a matrix: @\> (2><3)[1..6] (2><3) [ 1.0, 2.0, 3.0 , 4.0, 5.0, 6.0 ]@ This is the format produced by the instances of Show (Matrix a), which can also be used for input. The input list is explicitly truncated, so that it can safely be used with lists that are too long (like infinite lists). Example: @\> (2>|<3)[1..] (2><3) [ 1.0, 2.0, 3.0 , 4.0, 5.0, 6.0 ]@ -} (><) :: (Element a) => Int -> Int -> [a] -> Matrix a r >< c = f where f l | dim v == r*c = matrixFromVector RowMajor c v | otherwise = error $ "inconsistent list size = " ++show (dim v) ++" in ("++show r++"><"++show c++")" where v = fromList $ take (r*c) l ---------------------------------------------------------------- -- | Creates a matrix with the first n rows of another matrix takeRows :: Element t => Int -> Matrix t -> Matrix t takeRows n mt = subMatrix (0,0) (n, cols mt) mt -- | Creates a copy of a matrix without the first n rows dropRows :: Element t => Int -> Matrix t -> Matrix t dropRows n mt = subMatrix (n,0) (rows mt - n, cols mt) mt -- |Creates a matrix with the first n columns of another matrix takeColumns :: Element t => Int -> Matrix t -> Matrix t takeColumns n mt = subMatrix (0,0) (rows mt, n) mt -- | Creates a copy of a matrix without the first n columns dropColumns :: Element t => Int -> Matrix t -> Matrix t dropColumns n mt = subMatrix (0,n) (rows mt, cols mt - n) mt ---------------------------------------------------------------- {- | Creates a 'Matrix' from a list of lists (considered as rows). @\> fromLists [[1,2],[3,4],[5,6]] (3><2) [ 1.0, 2.0 , 3.0, 4.0 , 5.0, 6.0 ]@ -} fromLists :: Element t => [[t]] -> Matrix t fromLists = fromRows . map fromList -- | creates a 1-row matrix from a vector asRow :: Element a => Vector a -> Matrix a asRow v = reshape (dim v) v -- | creates a 1-column matrix from a vector asColumn :: Element a => Vector a -> Matrix a asColumn v = reshape 1 v {- | creates a Matrix of the specified size using the supplied function to to map the row/column position to the value at that row/column position. @> buildMatrix 3 4 (\ (r,c) -> fromIntegral r * fromIntegral c) (3><4) [ 0.0, 0.0, 0.0, 0.0, 0.0 , 0.0, 1.0, 2.0, 3.0, 4.0 , 0.0, 2.0, 4.0, 6.0, 8.0]@ -} buildMatrix :: Element a => Int -> Int -> ((Int, Int) -> a) -> Matrix a buildMatrix rc cc f = fromLists $ map (\x -> map f x) $ map (\ ri -> map (\ ci -> (ri, ci)) [0 .. (cc - 1)]) [0 .. (rc - 1)] ----------------------------------------------------- fromArray2D :: (Element e) => Array (Int, Int) e -> Matrix e fromArray2D m = (r> Int -> a -> String shf dec n | abs n < 1e-10 = "0." | abs (n - (fromIntegral.round $ n)) < 1e-10 = show (round n) ++"." | otherwise = showGFloat (Just dec) n "" -- shows a Complex Double as a pair, with n digits after the decimal point shfc n z@ (a:+b) | magnitude z <1e-10 = "0." | abs b < 1e-10 = shf n a | abs a < 1e-10 = shf n b ++"i" | b > 0 = shf n a ++"+"++shf n b ++"i" | otherwise = shf n a ++shf n b ++"i" -} dsp' :: String -> [[String]] -> String dsp' sep as = unlines . 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 sep {- | Creates a string from a matrix given a separator and a function to show each entry. Using this function the user can easily define any desired display function: @import Text.Printf(printf)@ @disp = putStr . format \" \" (printf \"%.2f\")@ -} format :: (Element t) => String -> (t -> String) -> Matrix t -> String format sep f m = dsp' sep . map (map f) . toLists $ m {- disp m f = putStrLn $ "matrix ("++show (rows m) ++"x"++ show (cols m) ++")\n"++format " | " f m dispR :: Int -> Matrix Double -> IO () dispR d m = disp m (shf d) dispC :: Int -> Matrix (Complex Double) -> IO () dispC d m = disp m (shfc d) -} ------------------------------------------------------------------- -- display utilities {- | Show a matrix with \"autoscaling\" and a given number of decimal places. @disp = putStr . disps 2 \> disp $ 120 * (3><4) [1..] 3x4 E3 0.12 0.24 0.36 0.48 0.60 0.72 0.84 0.96 1.08 1.20 1.32 1.44 @ -} disps :: Int -> Matrix Double -> String disps d x = sdims x ++ " " ++ formatScaled d x {- | Show a matrix with a given number of decimal places. @disp = putStr . dispf 3 \> disp (1/3 + ident 4) 4x4 1.333 0.333 0.333 0.333 0.333 1.333 0.333 0.333 0.333 0.333 1.333 0.333 0.333 0.333 0.333 1.333 @ -} dispf :: Int -> Matrix Double -> String dispf d x = sdims x ++ "\n" ++ formatFixed (if isInt x then 0 else d) x sdims x = show (rows x) ++ "x" ++ show (cols x) formatFixed d x = format " " (printf ("%."++show d++"f")) $ x isInt = all lookslikeInt . toList . flatten where lookslikeInt x = show (round x :: Int) ++".0" == shx || "-0.0" == shx where shx = show x formatScaled dec t = "E"++show o++"\n" ++ ss where ss = format " " (printf fmt. g) t g x | o >= 0 = x/10^(o::Int) | otherwise = x*10^(-o) o = floor $ maximum $ map (logBase 10 . abs) $ toList $ flatten t fmt = '%':show (dec+3) ++ '.':show dec ++"f" {- | Show a vector using a function for showing matrices. @disp = putStr . vecdisp (dispf 2) \> disp (linspace 10 (0,1)) 10 |> 0.00 0.11 0.22 0.33 0.44 0.56 0.67 0.78 0.89 1.00 @ -} vecdisp :: (Element t) => (Matrix t -> String) -> Vector t -> String vecdisp f v = ((show (dim v) ++ " |> ") ++) . (++"\n") . unwords . lines . tail . dropWhile (not . (`elem` " \n")) . f . trans . reshape 1 $ v -------------------------------------------------------------------- -- | reads a matrix from a string containing a table of numbers. readMatrix :: String -> Matrix Double readMatrix = fromLists . map (map read). map words . filter (not.null) . lines {- | obtains the number of rows and columns in an ASCII data file (provisionally using unix's wc). -} fileDimensions :: FilePath -> IO (Int,Int) fileDimensions fname = do wcres <- readProcess "wc" ["-w",fname] "" contents <- readFile fname let tot = read . head . words $ wcres c = length . head . dropWhile null . map words . lines $ contents if tot > 0 then return (tot `div` c, c) else return (0,0) -- | Loads a matrix from an ASCII file formatted as a 2D table. loadMatrix :: FilePath -> IO (Matrix Double) loadMatrix file = fromFile file =<< fileDimensions file -- | Loads a matrix from an ASCII file (the number of rows and columns must be known in advance). fromFile :: FilePath -> (Int,Int) -> IO (Matrix Double) fromFile filename (r,c) = reshape c `fmap` fscanfVector filename (r*c) -- | rearranges the rows of a matrix according to the order given in a list of integers. extractRows :: Element t => [Int] -> Matrix t -> Matrix t extractRows l m = fromRows $ extract (toRows $ m) l where extract l' is = [l'!!i |i<-is] {- | creates matrix by repetition of a matrix a given number of rows and columns @> repmat (ident 2) 2 3 :: Matrix Double (4><6) [ 1.0, 0.0, 1.0, 0.0, 1.0, 0.0 , 0.0, 1.0, 0.0, 1.0, 0.0, 1.0 , 1.0, 0.0, 1.0, 0.0, 1.0, 0.0 , 0.0, 1.0, 0.0, 1.0, 0.0, 1.0 ]@ -} repmat :: (Element t) => Matrix t -> Int -> Int -> Matrix t repmat m r c = fromBlocks $ partit c $ replicate (r*c) m