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|
-----------------------------------------------------------------------------
-- |
-- Module : Numeric.IO
-- Copyright : (c) Alberto Ruiz 2010
-- License : GPL
--
-- Maintainer : Alberto Ruiz <aruiz@um.es>
-- Stability : provisional
-- Portability : portable
--
-- Display, formatting and IO functions for numeric 'Vector' and 'Matrix'
--
-----------------------------------------------------------------------------
module Numeric.IO (
dispf, disps, dispcf, vecdisp, latexFormat, format,
loadMatrix, saveMatrix, fromFile, fileDimensions,
readMatrix, fromArray2D,
fscanfVector, fprintfVector, freadVector, fwriteVector
) where
import Data.Packed
import Data.Packed.IO
import System.Process(readProcess)
import Numeric.GSL.Vector
{- | 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)
|
