7 files changed, 103 insertions, 9 deletions

diff --git a/packages/base/src/C/lapack-aux.c b/packages/base/src/C/lapack-aux.c
index 77381cc..a977d5f 100644
--- a/packages/base/src/C/lapack-aux.c
+++ b/packages/base/src/C/lapack-aux.c
@@ -1670,3 +1670,31 @@ int extractI(int modei, int modej, int tm, KIVEC(i), KIVEC(j), KIMAT(m), IMAT(r)
     EXTRACT_IMP
 }
 
+//////////////////////// remap /////////////////////////////////
+
+#define REMAP_IMP                                               \
+    REQUIRES(ir==jr && ic==jc && ir==rr && ic==rc ,BAD_SIZE);   \
+    { TRAV(r,a,b) { AT(r,a,b) = AT(m,AT(i,a,b),AT(j,a,b)); }    \
+    }                                                           \
+    OK
+
+int remapD(KOIMAT(i), KOIMAT(j), KODMAT(m), ODMAT(r)) {
+    REMAP_IMP
+}
+
+int remapF(KOIMAT(i), KOIMAT(j), KOFMAT(m), OFMAT(r)) {
+    REMAP_IMP
+}
+
+int remapI(KOIMAT(i), KOIMAT(j), KOIMAT(m), OIMAT(r)) {
+    REMAP_IMP
+}
+
+int remapC(KOIMAT(i), KOIMAT(j), KOCMAT(m), OCMAT(r)) {
+    REMAP_IMP
+}
+
+int remapQ(KOIMAT(i), KOIMAT(j), KOQMAT(m), OQMAT(r)) {
+    REMAP_IMP
+}
+
diff --git a/packages/base/src/C/lapack-aux.h b/packages/base/src/C/lapack-aux.h
index b49c7c9..6ffbef1 100644
--- a/packages/base/src/C/lapack-aux.h
+++ b/packages/base/src/C/lapack-aux.h
@@ -42,6 +42,7 @@ typedef short ftnlen;
 #define QVEC(A) int A##n, complex*A##p
 #define CVEC(A) int A##n, doublecomplex*A##p
 #define PVEC(A) int A##n, void* A##p, int A##s
+
 #define IMAT(A) int A##r, int A##c, int* A##p
 #define FMAT(A) int A##r, int A##c, float* A##p
 #define DMAT(A) int A##r, int A##c, double* A##p
@@ -49,12 +50,20 @@ typedef short ftnlen;
 #define CMAT(A) int A##r, int A##c, doublecomplex* A##p
 #define PMAT(A) int A##r, int A##c, void* A##p, int A##s
 
+#define OIMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, int* A##p
+#define OFMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, float* A##p
+#define ODMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, double* A##p
+#define OQMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, complex* A##p
+#define OCMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, doublecomplex* A##p
+
+
 #define KIVEC(A) int A##n, const int*A##p
 #define KFVEC(A) int A##n, const float*A##p
 #define KDVEC(A) int A##n, const double*A##p
 #define KQVEC(A) int A##n, const complex*A##p
 #define KCVEC(A) int A##n, const doublecomplex*A##p
 #define KPVEC(A) int A##n, const void* A##p, int A##s
+
 #define KIMAT(A) int A##r, int A##c, const int* A##p
 #define KFMAT(A) int A##r, int A##c, const float* A##p
 #define KDMAT(A) int A##r, int A##c, const double* A##p
@@ -62,3 +71,12 @@ typedef short ftnlen;
 #define KCMAT(A) int A##r, int A##c, const doublecomplex* A##p
 #define KPMAT(A) int A##r, int A##c, const void* A##p, int A##s
 
+#define KOIMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, const int* A##p
+#define KOFMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, const float* A##p
+#define KODMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, const double* A##p
+#define KOQMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, const complex* A##p
+#define KOCMAT(A) int A##r, int A##c, int A##Xr, int A##Xc, const doublecomplex* A##p
+
+#define AT(m,i,j) (m##p[(i)*m##Xr + (j)*m##Xc])
+#define TRAV(m,i,j) int i,j; for (i=0;i<m##r;i++) for (j=0;j<m##c;j++)
+
diff --git a/packages/base/src/Data/Packed/Internal/Matrix.hs b/packages/base/src/Data/Packed/Internal/Matrix.hs
index 82a9d8f..ddeddae 100644
--- a/packages/base/src/Data/Packed/Internal/Matrix.hs
+++ b/packages/base/src/Data/Packed/Internal/Matrix.hs
@@ -105,6 +105,14 @@ cols = icols
 orderOf :: Matrix t -> MatrixOrder
 orderOf = order
 
+stepRow :: Matrix t -> CInt
+stepRow Matrix {icols = c, order = RowMajor } = fromIntegral c
+stepRow _                                     = 1
+
+stepCol :: Matrix t -> CInt
+stepCol Matrix {irows = r, order = ColumnMajor } = fromIntegral r
+stepCol _                                        = 1
+
 
 -- | Matrix transpose.
 trans :: Matrix t -> Matrix t
@@ -128,6 +136,14 @@ mat a f =
             g (fi (rows a)) (fi (cols a)) p
         f m
 
+omat :: (Storable t) => Matrix t -> (((CInt -> CInt -> CInt -> CInt -> Ptr t -> t1) -> t1) -> IO b) -> IO b
+omat a f =
+    unsafeWith (xdat a) $ \p -> do
+        let m g = do
+            g (fi (rows a)) (fi (cols a)) (stepRow a) (stepCol a) p
+        f m
+
+
 {- | Creates a vector by concatenation of rows. If the matrix is ColumnMajor, this operation requires a transpose.
 
 >>> flatten (ident 3)
@@ -257,7 +273,7 @@ compat m1 m2 = rows m1 == rows m2 && cols m1 == cols m2
     >instance Element Foo
 -}
 class (Storable a) => Element a where
-    subMatrixD :: (Int,Int) -- ^ (r0,c0) starting position 
+    subMatrixD :: (Int,Int) -- ^ (r0,c0) starting position
                -> (Int,Int) -- ^ (rt,ct) dimensions of submatrix
                -> Matrix a -> Matrix a
     subMatrixD = subMatrix'
@@ -270,6 +286,7 @@ class (Storable a) => Element a where
     sortV    :: Ord a => Vector a -> Vector a
     compareV :: Ord a => Vector a -> Vector a -> Vector CInt
     selectV  :: Vector CInt -> Vector a -> Vector a -> Vector a -> Vector a
+    remapM   :: Matrix CInt -> Matrix CInt -> Matrix a -> Matrix a
 
 
 instance Element Float where
@@ -280,7 +297,7 @@ instance Element Float where
     sortV      = sortValF
     compareV   = compareF
     selectV    = selectF
-    
+    remapM     = remapF
 
 instance Element Double where
     transdata  = transdataAux ctransR
@@ -290,6 +307,7 @@ instance Element Double where
     sortV      = sortValD
     compareV   = compareD
     selectV    = selectD
+    remapM     = remapD
 
 
 instance Element (Complex Float) where
@@ -300,6 +318,7 @@ instance Element (Complex Float) where
     sortV      = undefined
     compareV   = undefined
     selectV    = selectQ
+    remapM     = remapQ
 
 
 instance Element (Complex Double) where
@@ -310,8 +329,8 @@ instance Element (Complex Double) where
     sortV      = undefined
     compareV   = undefined
     selectV    = selectC
+    remapM     = remapC
 
-    
 instance Element (CInt) where
     transdata  = transdataAux ctransI
     constantD  = constantAux cconstantI
@@ -320,7 +339,7 @@ instance Element (CInt) where
     sortV      = sortValI
     compareV   = compareI
     selectV    = selectI
-
+    remapM     = remapI
 
 -------------------------------------------------------------------
 
@@ -394,7 +413,7 @@ foreign import ccall unsafe "constantP" cconstantP :: Ptr () -> CInt -> Ptr () -
 
 -- | Extracts a submatrix from a matrix.
 subMatrix :: Element a
-          => (Int,Int) -- ^ (r0,c0) starting position 
+          => (Int,Int) -- ^ (r0,c0) starting position
           -> (Int,Int) -- ^ (rt,ct) dimensions of submatrix
           -> Matrix a -- ^ input matrix
           -> Matrix a -- ^ result
@@ -427,7 +446,7 @@ conformMs ms = map (conformMTo (r,c)) ms
   where
     r = maxZ (map rows ms)
     c = maxZ (map cols ms)
-    
+
 
 conformVs vs = map (conformVTo n) vs
   where
@@ -554,4 +573,25 @@ foreign import ccall unsafe "chooseI" c_selectI :: Sel CInt
 foreign import ccall unsafe "chooseC" c_selectC :: Sel (Complex Double)
 foreign import ccall unsafe "chooseQ" c_selectQ :: Sel (Complex Float)
 
+---------------------------------------------------------------------------
+
+remapG f i j m = unsafePerformIO $ do
+    r <- createMatrix RowMajor (rows i) (cols i)
+    app4 f omat i omat j omat m omat r "remapG"
+    return r
+
+remapD = remapG c_remapD
+remapF = remapG c_remapF
+remapI = remapG c_remapI
+remapC = remapG c_remapC
+remapQ = remapG c_remapQ
+
+type Rem x = OM CInt (OM CInt (OM x (OM x (IO CInt))))
+
+foreign import ccall unsafe "remapD" c_remapD :: Rem Double
+foreign import ccall unsafe "remapF" c_remapF :: Rem Float
+foreign import ccall unsafe "remapI" c_remapI :: Rem CInt
+foreign import ccall unsafe "remapC" c_remapC :: Rem (Complex Double)
+foreign import ccall unsafe "remapQ" c_remapQ :: Rem (Complex Float)
+
 
diff --git a/packages/base/src/Data/Packed/Internal/Numeric.hs b/packages/base/src/Data/Packed/Internal/Numeric.hs
index a241c48..67d047c 100644
--- a/packages/base/src/Data/Packed/Internal/Numeric.hs
+++ b/packages/base/src/Data/Packed/Internal/Numeric.hs
@@ -39,7 +39,7 @@ module Data.Packed.Internal.Numeric (
     roundVector, fromInt, toInt,
     RealOf, ComplexOf, SingleOf, DoubleOf,
     IndexOf,
-    I, Extractor(..), (??), range, idxs,
+    I, Extractor(..), (??), range, idxs, remapM,
     module Data.Complex
 ) where
 
diff --git a/packages/base/src/Data/Packed/Internal/Signatures.hs b/packages/base/src/Data/Packed/Internal/Signatures.hs
index 37dac16..5c54498 100644
--- a/packages/base/src/Data/Packed/Internal/Signatures.hs
+++ b/packages/base/src/Data/Packed/Internal/Signatures.hs
@@ -71,5 +71,7 @@ type TMMCVM = CInt -> CInt -> PD -> TMCVM       --
 type CM b r = CInt -> CInt -> Ptr b -> r
 type CV b r = CInt -> Ptr b -> r
 
+type OM b r = CInt -> CInt -> CInt -> CInt -> Ptr b -> r
+
 type CIdxs r = CV CInt r
 
diff --git a/packages/base/src/Data/Packed/Numeric.hs b/packages/base/src/Data/Packed/Numeric.hs
index 906bc83..80f1718 100644
--- a/packages/base/src/Data/Packed/Numeric.hs
+++ b/packages/base/src/Data/Packed/Numeric.hs
@@ -31,7 +31,7 @@ module Data.Packed.Numeric (
     diag, ident,
     ctrans,
     -- * Generic operations
-    Container(..), Numeric, Extractor(..), (??), range, idxs, I,
+    Container(..), Numeric, Extractor(..), (??), range, idxs, I, remap,
     -- add, mul, sub, divide, equal, scaleRecip, addConstant,
     scalar, conj, scale, arctan2, cmap, cmod,
     atIndex, minIndex, maxIndex, minElement, maxElement,
@@ -315,3 +315,9 @@ ccompare = ccompare'
 cselect :: (Container c t) => c I -> c t -> c t -> c t -> c t
 cselect = cselect'
 
+remap :: Element t => Matrix I -> Matrix I -> Matrix t -> Matrix t
+remap i j m
+    | minElement i >= 0 && maxElement i < fromIntegral (rows m) &&
+      minElement j >= 0 && maxElement j < fromIntegral (cols m) = remapM i j m
+    | otherwise = error $ "out of range index in rmap"
+
diff --git a/packages/base/src/Numeric/LinearAlgebra/Data.hs b/packages/base/src/Numeric/LinearAlgebra/Data.hs
index 79dd06b..8bacb09 100644
--- a/packages/base/src/Numeric/LinearAlgebra/Data.hs
+++ b/packages/base/src/Numeric/LinearAlgebra/Data.hs
@@ -53,7 +53,7 @@ module Numeric.LinearAlgebra.Data(
     -- * Matrix extraction
     Extractor(..), (??),
     takeRows, dropRows, takeColumns, dropColumns, subMatrix, (?), (¿), fliprl, flipud,
-
+    remap,
 
     -- * Block matrix
     fromBlocks, (|||), (===), diagBlock, repmat, toBlocks, toBlocksEvery,