1 files changed, 22 insertions, 13 deletions

diff --git a/lib/Data/Packed/Matrix.hs b/lib/Data/Packed/Matrix.hs
index 2922cbe..aad73dd 100644
--- a/lib/Data/Packed/Matrix.hs
+++ b/lib/Data/Packed/Matrix.hs
@@ -300,16 +300,24 @@ repmat :: (Element t) => Matrix t -> Int -> Int -> Matrix t
 repmat m r c = fromBlocks $ splitEvery c $ replicate (r*c) m
 
 -- | A version of 'liftMatrix2' which automatically adapt matrices with a single row or column to match the dimensions of the other matrix.
-liftMatrix2Auto :: (Element t, Element a, Element b)
-             => (Vector a -> Vector b -> Vector t) -> Matrix a -> Matrix b -> Matrix t
-liftMatrix2Auto f m1 m2 | compat' m1 m2 = lM f m1 m2
-                     | rows m1 == rows m2 && cols m2 == 1 = lM f m1 (repCols (cols m1) m2)
-                     | rows m1 == rows m2 && cols m1 == 1 = lM f (repCols (cols m2) m1) m2
-                     | cols m1 == cols m2 && rows m2 == 1 = lM f m1 (repRows (rows m1) m2)
-                     | cols m1 == cols m2 && cols m1 == 1 = lM f (repRows (rows m2) m1) m2
-                     | rows m1 == 1 && cols m2 == 1 = lM f (repRows (rows m2) m1) (repCols (cols m1) m2)
-                     | cols m1 == 1 && rows m2 == 1 = lM f (repCols (cols m2) m1) (repRows (rows m1) m2)
-                     | otherwise    = error $ "nonconformable matrices in liftMatrix2Auto: " ++ show (size m1) ++ ", " ++ show (size m2)
+liftMatrix2Auto :: (Element t, Element a, Element b) => (Vector a -> Vector b -> Vector t) -> Matrix a -> Matrix b -> Matrix t
+liftMatrix2Auto f m1 m2
+    | compat' m1 m2 = lM f m1 m2
+
+    | r1 == 1  && c2 == 1 = lM f (repRows r2 m1) (repCols c1 m2)
+    | c1 == 1  && r2 == 1 = lM f (repCols c2 m1) (repRows r1 m2)
+    
+    | r1 == r2 && c2 == 1 = lM f m1              (repCols c1 m2)
+    | r1 == r2 && c1 == 1 = lM f (repCols c2 m1) m2
+
+    | c1 == c2 && r2 == 1 = lM f m1              (repRows r1 m2)
+    | c1 == c2 && r1 == 1 = lM f (repRows r2 m1) m2
+
+    | otherwise    = error $ "nonconformable matrices in liftMatrix2Auto: "
+                             ++ show (size m1) ++ ", " ++ show (size m2)
+  where
+    (r1,c1) = size m1
+    (r2,c2) = size m2
 
 size m = (rows m, cols m)
 
@@ -319,9 +327,10 @@ repRows n x = fromRows (replicate n (flatten x))
 repCols n x = fromColumns (replicate n (flatten x))
 
 compat' :: Matrix a -> Matrix b -> Bool
-compat' m1 m2 = rows m1 == 1 && cols m1 == 1
-             || rows m2 == 1 && cols m2 == 1
-             || rows m1 == rows m2 && cols m1 == cols m2
+compat' m1 m2 = s1 == (1,1) || s2 == (1,1) || s1 == s2
+  where
+    s1 = size m1
+    s2 = size m2
 
 ------------------------------------------------------------