From 1838c4248679b7476bb8716a76171712dc3cd335 Mon Sep 17 00:00:00 2001
From: Alberto Ruiz <aruiz@um.es>
Date: Fri, 16 May 2014 13:35:35 +0200
Subject: linear algebra moved

---
 .../src/Numeric/LinearAlgebra/Util/Convolution.hs  | 114 ---------------------
 1 file changed, 114 deletions(-)
 delete mode 100644 packages/hmatrix/src/Numeric/LinearAlgebra/Util/Convolution.hs

(limited to 'packages/hmatrix/src/Numeric/LinearAlgebra/Util/Convolution.hs')

diff --git a/packages/hmatrix/src/Numeric/LinearAlgebra/Util/Convolution.hs b/packages/hmatrix/src/Numeric/LinearAlgebra/Util/Convolution.hs
deleted file mode 100644
index 82de476..0000000
--- a/packages/hmatrix/src/Numeric/LinearAlgebra/Util/Convolution.hs
+++ /dev/null
@@ -1,114 +0,0 @@
-{-# LANGUAGE FlexibleContexts #-}
------------------------------------------------------------------------------
-{- |
-Module      :  Numeric.LinearAlgebra.Util.Convolution
-Copyright   :  (c) Alberto Ruiz 2012
-License     :  GPL
-
-Maintainer  :  Alberto Ruiz (aruiz at um dot es)
-Stability   :  provisional
-
--}
------------------------------------------------------------------------------
-
-module Numeric.LinearAlgebra.Util.Convolution(
-   corr, conv, corrMin,
-   corr2, conv2, separable
-) where
-
-import Numeric.LinearAlgebra
-
-
-vectSS :: Element t => Int -> Vector t -> Matrix t
-vectSS n v = fromRows [ subVector k n v | k <- [0 .. dim v - n] ]
-
-
-corr :: Product t => Vector t -- ^ kernel
-                  -> Vector t -- ^ source
-                  -> Vector t
-{- ^ correlation
-
->>> corr (fromList[1,2,3]) (fromList [1..10])
-fromList [14.0,20.0,26.0,32.0,38.0,44.0,50.0,56.0]
-
--}
-corr ker v | dim ker <= dim v = vectSS (dim ker) v <> ker
-           | otherwise = error $ "corr: dim kernel ("++show (dim ker)++") > dim vector ("++show (dim v)++")"
-
-
-conv :: (Product t, Num t) => Vector t -> Vector t -> Vector t
-{- ^ convolution ('corr' with reversed kernel and padded input, equivalent to polynomial product)
-
->>> conv (fromList[1,1]) (fromList [-1,1])
-fromList [-1.0,0.0,1.0]
-
--}
-conv ker v = corr ker' v'
-  where
-    ker' = (flatten.fliprl.asRow) ker
-    v' | dim ker > 1 = vjoin [z,v,z]
-       | otherwise   = v
-    z = constant 0 (dim ker -1)
-
-corrMin :: (Container Vector t, RealElement t, Product t)
-        => Vector t
-        -> Vector t
-        -> Vector t
--- ^ similar to 'corr', using 'min' instead of (*)
-corrMin ker v = minEvery ss (asRow ker) <> ones
-  where
-    minEvery a b = cond a b a a b
-    ss = vectSS (dim ker) v
-    ones = konst 1 (dim ker)
-
-
-
-matSS :: Element t => Int -> Matrix t -> [Matrix t]
-matSS dr m = map (reshape c) [ subVector (k*c) n v | k <- [0 .. r - dr] ]
-  where
-    v = flatten m
-    c = cols m
-    r = rows m
-    n = dr*c
-
-
-corr2 :: Product a => Matrix a -> Matrix a -> Matrix a
--- ^ 2D correlation
-corr2 ker mat = dims
-              . concatMap (map (udot ker' . flatten) . matSS c . trans)
-              . matSS r $ mat
-  where
-    r = rows ker
-    c = cols ker
-    ker' = flatten (trans ker)
-    rr = rows mat - r + 1
-    rc = cols mat - c + 1
-    dims | rr > 0 && rc > 0 = (rr >< rc)
-         | otherwise = error $ "corr2: dim kernel ("++sz ker++") > dim matrix ("++sz mat++")"
-    sz m = show (rows m)++"x"++show (cols m)
-
-conv2 :: (Num a, Product a, Container Vector a) => Matrix a -> Matrix a -> Matrix a
--- ^ 2D convolution
-conv2 k m = corr2 (fliprl . flipud $ k) pm
-  where
-    pm | r == 0 && c == 0 = m
-       | r == 0           = fromBlocks [[z3,m,z3]]
-       |           c == 0 = fromBlocks [[z2],[m],[z2]]
-       | otherwise        = fromBlocks [[z1,z2,z1]
-                                       ,[z3, m,z3]
-                                       ,[z1,z2,z1]]
-    r = rows k - 1
-    c = cols k - 1
-    h = rows m
-    w = cols m
-    z1 = konst 0 (r,c)
-    z2 = konst 0 (r,w)
-    z3 = konst 0 (h,c)
-
--- TODO: could be simplified using future empty arrays
-
-
-separable :: Element t => (Vector t -> Vector t) -> Matrix t -> Matrix t
--- ^ matrix computation implemented as separated vector operations by rows and columns.
-separable f = fromColumns . map f . toColumns . fromRows . map f . toRows
-
-- 
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