Hello, World!

This is the initial commit for Eigen2, since I restarted it from scratch on Sunday.
2026-04-10 11:34:33 +08:00 · 2007-09-05 10:42:15 +00:00
parent 7eeb620880
commit 1dabb45d94
18 changed files with 1816 additions and 0 deletions
--- a/src/Block.h
+++ b/src/Block.h
@@ -0,0 +1,114 @@
+// 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 EIGEN_BLOCK_H
+#define EIGEN_BLOCK_H
+
+namespace Eigen {
+
+template<typename MatrixType> class MatrixBlock
+{
+  public:
+    typedef typename MatrixType::Scalar Scalar;
+
+    MatrixBlock(const MatrixType& matrix, int startRow, int endRow,
+                                          int startCol = 0, int endCol = 0)
+      : m_matrix(matrix), m_startRow(startRow), m_endRow(endRow),
+                          m_startCol(startCol), m_endCol(endCol)
+    {
+      assert(startRow >= 0 && startRow <= endRow && endRow < matrix.rows()
+          && startCol >= 0 && startCol <= endCol && endCol < matrix.cols());
+    }
+    
+    MatrixBlock(const MatrixBlock& other)
+      : m_matrix(other.m_matrix), m_startRow(other.m_startRow), m_endRow(other.m_endRow),
+                                  m_startCol(other.m_startCol), m_endCol(other.m_endCol) {}
+    
+    int rows() const { return m_endRow - m_startRow + 1; }
+    int cols() const { return m_endCol - m_startCol + 1; }
+    
+    Scalar& operator()(int row, int col=0)
+    {
+      return m_matrix(row + m_startRow, col + m_startCol);
+    }
+    
+    Scalar operator()(int row, int col=0) const
+    {
+      return m_matrix(row + m_startRow, col + m_startCol);
+    }
+    
+  protected:
+    MatrixType m_matrix;
+    const int m_startRow, m_endRow, m_startCol, m_endCol;
+};
+
+template<typename Derived>
+MatrixConstXpr<
+  MatrixBlock<
+    const MatrixConstRef<
+      MatrixBase<Derived>
+    >
+  >
+>
+MatrixBase<Derived>::block(int startRow, int endRow, int startCol, int endCol) const
+{
+  typedef MatrixBlock<const ConstRef> ProductType;
+  typedef MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(constRef(), startRow, endRow, startCol, endCol));
+}
+
+template<typename Content>
+MatrixConstXpr<
+  MatrixBlock<
+    const MatrixConstXpr<Content>
+  >
+>
+MatrixConstXpr<Content>::block(int startRow, int endRow, int startCol, int endCol) const
+{
+  typedef MatrixBlock<
+            const MatrixConstXpr<Content>
+          > ProductType;
+  typedef MatrixConstXpr<ProductType> XprType;
+  return XprType(ProductType(*this, startRow, endRow, startCol, endCol));
+}
+
+template<typename Content>
+MatrixXpr<
+  MatrixBlock<
+    MatrixXpr<Content>
+  >
+>
+MatrixXpr<Content>::block(int startRow, int endRow, int startCol, int endCol)
+{
+  typedef MatrixBlock<
+            MatrixXpr<Content>
+          > ProductType;
+  typedef MatrixXpr<ProductType> XprType;
+  return XprType(ProductType(*this, startRow, endRow, startCol, endCol));
+}
+
+}
+
+#endif // EIGEN_BLOCK_H