From de22ad117cb5324e3e1d0700dde7466921fdf9ca Mon Sep 17 00:00:00 2001
From: Kibeom Kim <kkimlabs@gmail.com>
Date: Thu, 17 Nov 2011 17:57:45 -0500
Subject: bug #157 - Implemented *= /= * / operations for VectorwiseOp (e.g.
 mat.colwise())

---
 Eigen/src/Core/VectorwiseOp.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/Eigen/src/Core/VectorwiseOp.h b/Eigen/src/Core/VectorwiseOp.h
index 20f688157..b61234b57 100644
--- a/Eigen/src/Core/VectorwiseOp.h
+++ b/Eigen/src/Core/VectorwiseOp.h
@@ -444,6 +444,26 @@ template<typename ExpressionType, int Direction> class VectorwiseOp
       return const_cast<ExpressionType&>(m_matrix);
     }
 
+    /** Multiplies the vector \a other to each subvector of \c *this */
+    template<typename OtherDerived>
+    ExpressionType& operator*=(const DenseBase<OtherDerived>& other)
+    {
+      EIGEN_STATIC_ASSERT_VECTOR_ONLY(OtherDerived)
+      for(Index j=0; j<subVectors(); ++j)
+        subVector(j).array() *= other.derived().array();
+      return const_cast<ExpressionType&>(m_matrix);
+    }
+
+    /** Divides the vector \a other to each subvector of \c *this */
+    template<typename OtherDerived>
+    ExpressionType& operator/=(const DenseBase<OtherDerived>& other)
+    {
+      EIGEN_STATIC_ASSERT_VECTOR_ONLY(OtherDerived)
+      for(Index j=0; j<subVectors(); ++j)
+        subVector(j).array() /= other.derived();
+      return const_cast<ExpressionType&>(m_matrix);
+    }
+
     /** Returns the expression of the sum of the vector \a other to each subvector of \c *this */
     template<typename OtherDerived> EIGEN_STRONG_INLINE
     CwiseBinaryOp<internal::scalar_sum_op<Scalar>,
@@ -466,6 +486,28 @@ template<typename ExpressionType, int Direction> class VectorwiseOp
       return m_matrix - extendedTo(other.derived());
     }
 
+    /** Returns the expression of the multiplication of the vector \a other to each subvector of \c *this */
+    template<typename OtherDerived> EIGEN_STRONG_INLINE
+    CwiseBinaryOp<internal::scalar_product_op<Scalar>,
+                  const ExpressionTypeNestedCleaned,
+                  const typename ExtendedType<OtherDerived>::Type>
+    operator*(const DenseBase<OtherDerived>& other) const
+    {
+      EIGEN_STATIC_ASSERT_VECTOR_ONLY(OtherDerived);
+      return m_matrix * extendedTo(other.derived());
+    }
+
+    /** Returns the expression of the division between each subvector of \c *this and the vector \a other */
+    template<typename OtherDerived>
+    CwiseBinaryOp<internal::scalar_quotient_op<Scalar>,
+                  const ExpressionTypeNestedCleaned,
+                  const typename ExtendedType<OtherDerived>::Type>
+    operator/(const DenseBase<OtherDerived>& other) const
+    {
+      EIGEN_STATIC_ASSERT_VECTOR_ONLY(OtherDerived);
+      return m_matrix / extendedTo(other.derived());
+    }
+
 /////////// Geometry module ///////////
 
     #if EIGEN2_SUPPORT_STAGE > STAGE20_RESOLVE_API_CONFLICTS
-- 
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