From c0f76ce2cf1780c7b638071d45cba2a3d04f2f6f Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 11 Jul 2014 16:25:36 +0200
Subject: Fix bug #838: fix dense * sparse and sparse * dense outer products

---
 Eigen/src/SparseCore/SparseDenseProduct.h | 33 ++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

(limited to 'Eigen')

diff --git a/Eigen/src/SparseCore/SparseDenseProduct.h b/Eigen/src/SparseCore/SparseDenseProduct.h
index 610833f3b..a3772c255 100644
--- a/Eigen/src/SparseCore/SparseDenseProduct.h
+++ b/Eigen/src/SparseCore/SparseDenseProduct.h
@@ -19,7 +19,10 @@ template<typename Lhs, typename Rhs, int InnerSize> struct SparseDenseProductRet
 
 template<typename Lhs, typename Rhs> struct SparseDenseProductReturnType<Lhs,Rhs,1>
 {
-  typedef SparseDenseOuterProduct<Lhs,Rhs,false> Type;
+  typedef typename internal::conditional<
+    Lhs::IsRowMajor,
+    SparseDenseOuterProduct<Rhs,Lhs,true>,
+    SparseDenseOuterProduct<Lhs,Rhs,false> >::type Type;
 };
 
 template<typename Lhs, typename Rhs, int InnerSize> struct DenseSparseProductReturnType
@@ -29,7 +32,10 @@ template<typename Lhs, typename Rhs, int InnerSize> struct DenseSparseProductRet
 
 template<typename Lhs, typename Rhs> struct DenseSparseProductReturnType<Lhs,Rhs,1>
 {
-  typedef SparseDenseOuterProduct<Rhs,Lhs,true> Type;
+  typedef typename internal::conditional<
+    Rhs::IsRowMajor,
+    SparseDenseOuterProduct<Rhs,Lhs,true>,
+    SparseDenseOuterProduct<Lhs,Rhs,false> >::type Type;
 };
 
 namespace internal {
@@ -114,17 +120,30 @@ class SparseDenseOuterProduct<Lhs,Rhs,Transpose>::InnerIterator : public _LhsNes
     typedef typename SparseDenseOuterProduct::Index Index;
   public:
     EIGEN_STRONG_INLINE InnerIterator(const SparseDenseOuterProduct& prod, Index outer)
-      : Base(prod.lhs(), 0), m_outer(outer), m_factor(prod.rhs().coeff(outer))
-    {
-    }
+      : Base(prod.lhs(), 0), m_outer(outer), m_factor(get(prod.rhs(), outer, typename internal::traits<Rhs>::StorageKind() ))
+    { }
 
     inline Index outer() const { return m_outer; }
-    inline Index row() const { return Transpose ? Base::row() : m_outer; }
-    inline Index col() const { return Transpose ? m_outer : Base::row(); }
+    inline Index row() const { return Transpose ? m_outer : Base::index(); }
+    inline Index col() const { return Transpose ? Base::index() : m_outer; }
 
     inline Scalar value() const { return Base::value() * m_factor; }
 
   protected:
+    static Scalar get(const _RhsNested &rhs, Index outer, Dense = Dense())
+    {
+      return rhs.coeff(outer);
+    }
+    
+    static Scalar get(const _RhsNested &rhs, Index outer, Sparse = Sparse())
+    {
+      typename Traits::_RhsNested::InnerIterator it(rhs, outer);
+      if (it && it.index()==0)
+        return it.value();
+      
+      return Scalar(0);
+    }
+    
     Index m_outer;
     Scalar m_factor;
 };
-- 
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