From c768a44909ab52720a8f205dc78611bce83a55e6 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Mon, 1 Oct 2007 18:20:35 +0000
Subject: Add matrix transposition

---
 doc/tutorial.cpp         |  2 +-
 src/Manip                |  1 +
 src/internal/Object.h    |  1 +
 src/internal/Transpose.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/internal/Util.h      |  1 +
 5 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 src/internal/Transpose.h

diff --git a/doc/tutorial.cpp b/doc/tutorial.cpp
index a5b019531..794df8fd3 100644
--- a/doc/tutorial.cpp
+++ b/doc/tutorial.cpp
@@ -25,10 +25,10 @@ int main(int, char **)
   m2.block(2,3,2,3) = m - m;
   cout << "Now the 4x4 matrix m2 is:" << endl << m2 << endl;
   
-  cout << "The central 2x2 block of m2 is:" << endl << m2.block(1,2,1,2) << endl;
   cout << "Row 0 of m2 is:" << endl << m2.row(0) << endl;
   cout << "The third element in that row is " << m2.row(0)[2] << endl;
   cout << "Column 1 of m2 is:" << endl << m2.col(1) << endl;
+  cout << "The transpose of m2 is:" << endl << m2.transpose() << endl;
   cout << "The matrix m2 with row 0 and column 1 removed is:" << endl << m2.minor(0,1) << endl;
   
   return 0;
diff --git a/src/Manip b/src/Manip
index db4607091..4b13187bf 100644
--- a/src/Manip
+++ b/src/Manip
@@ -30,5 +30,6 @@
 #include "internal/Column.h"
 #include "internal/Block.h"
 #include "internal/Minor.h"
+#include "internal/Transpose.h"
 
 #endif // EI_MANIP_H
diff --git a/src/internal/Object.h b/src/internal/Object.h
index 6eec83e39..f7506d218 100644
--- a/src/internal/Object.h
+++ b/src/internal/Object.h
@@ -94,6 +94,7 @@ template<typename Scalar, typename Derived> class EiObject
     EiColumn<Derived> col(int i);
     EiMinor<Derived> minor(int row, int col);
     EiBlock<Derived> block(int startRow, int endRow, int startCol, int endCol);
+    EiTranspose<Derived> transpose();
     
     template<typename OtherDerived>
     EiMatrixProduct<Derived, OtherDerived>
diff --git a/src/internal/Transpose.h b/src/internal/Transpose.h
new file mode 100644
index 000000000..90a9b727c
--- /dev/null
+++ b/src/internal/Transpose.h
@@ -0,0 +1,74 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
+//
+// Eigen is free software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along
+// with Eigen; if not, write to the Free Software Foundation, Inc., 51
+// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// As a special exception, if other files instantiate templates or use macros
+// or functions from this file, or you compile this file and link it
+// with other works to produce a work based on this file, this file does not
+// by itself cause the resulting work to be covered by the GNU General Public
+// License. This exception does not invalidate any other reasons why a work
+// based on this file might be covered by the GNU General Public License.
+
+#ifndef EI_TRANSPOSE_H
+#define EI_TRANSPOSE_H
+
+template<typename MatrixType> class EiTranspose
+  : public EiObject<typename MatrixType::Scalar, EiTranspose<MatrixType> >
+{
+  public:
+    typedef typename MatrixType::Scalar Scalar;
+    typedef typename MatrixType::Ref MatRef;
+    friend class EiObject<Scalar, EiTranspose<MatrixType> >;
+    
+    static const int RowsAtCompileTime = MatrixType::ColsAtCompileTime,
+                     ColsAtCompileTime = MatrixType::RowsAtCompileTime;
+
+    EiTranspose(const MatRef& matrix) : m_matrix(matrix) {}
+    
+    EiTranspose(const EiTranspose& other)
+      : m_matrix(other.m_matrix) {}
+    
+    EI_INHERIT_ASSIGNMENT_OPERATORS(EiTranspose)
+    
+  private:
+    EiTranspose& _ref() { return *this; }
+    const EiTranspose& _constRef() const { return *this; }
+    int _rows() const { return m_matrix.cols(); }
+    int _cols() const { return m_matrix.rows(); }
+    
+    Scalar& _write(int row, int col)
+    {
+      return m_matrix.write(col, row);
+    }
+    
+    Scalar _read(int row, int col) const
+    {
+      return m_matrix.read(col, row);
+    }
+    
+  protected:
+    MatRef m_matrix;
+};
+
+template<typename Scalar, typename Derived>
+EiTranspose<Derived>
+EiObject<Scalar, Derived>::transpose()
+{
+  return EiTranspose<Derived>(static_cast<Derived*>(this)->ref());
+}
+
+#endif // EI_TRANSPOSE_H
diff --git a/src/internal/Util.h b/src/internal/Util.h
index e4c9a9e57..64d422115 100644
--- a/src/internal/Util.h
+++ b/src/internal/Util.h
@@ -48,6 +48,7 @@ template<typename MatrixType> class EiRow;
 template<typename MatrixType> class EiColumn;
 template<typename MatrixType> class EiMinor;
 template<typename MatrixType> class EiBlock;
+template<typename MatrixType> class EiTranspose;
 template<typename Lhs, typename Rhs> class EiSum;
 template<typename Lhs, typename Rhs> class EiDifference;
 template<typename Lhs, typename Rhs> class EiMatrixProduct;
-- 
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