From 3cd2a125b2712d6b7c620bef0671c6a05839d6e5 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Mon, 24 Dec 2007 11:14:25 +0000
Subject: - rework the coefficients API - make vectors use a separate loop
 unroller, so that copying a row-vector into a col-vector is now possible -
 add much more documentation - misc improvements

---
 doc/examples/class_Block.cpp    | 23 +++++++++++++++++++++++
 doc/examples/class_Cast.cpp     | 23 +++++++++++++++++++++++
 doc/examples/class_Column.cpp   | 19 +++++++++++++++++++
 doc/examples/class_DynBlock.cpp |  4 ++--
 doc/examples/class_Row.cpp      | 19 +++++++++++++++++++
 5 files changed, 86 insertions(+), 2 deletions(-)
 create mode 100644 doc/examples/class_Block.cpp
 create mode 100644 doc/examples/class_Cast.cpp
 create mode 100644 doc/examples/class_Column.cpp
 create mode 100644 doc/examples/class_Row.cpp

(limited to 'doc/examples')

diff --git a/doc/examples/class_Block.cpp b/doc/examples/class_Block.cpp
new file mode 100644
index 000000000..17dc4bce1
--- /dev/null
+++ b/doc/examples/class_Block.cpp
@@ -0,0 +1,23 @@
+#include <Eigen/Core.h>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+template<typename Scalar, typename Derived>
+Eigen::Block<Derived, 2, 2>
+topLeft2x2Corner(MatrixBase<Scalar, Derived>& m)
+{
+  return Eigen::Block<Derived, 2, 2>(m.ref(), 0, 0);
+  // note: tempting as it is, writing "m.block<2,2>(0,0)" here
+  // causes a compile error with g++ 4.2, apparently due to
+  // g++ getting confused by the many template types and
+  // template arguments involved.
+}
+
+int main(int, char**)
+{
+  Matrix3d m = Matrix3d::identity();
+  cout << topLeft2x2Corner(m) << endl;
+  topLeft2x2Corner(m) *= 2;
+  cout << "Now the matrix m is:" << endl << m << endl;
+  return 0;
+}
diff --git a/doc/examples/class_Cast.cpp b/doc/examples/class_Cast.cpp
new file mode 100644
index 000000000..d1dfdc8be
--- /dev/null
+++ b/doc/examples/class_Cast.cpp
@@ -0,0 +1,23 @@
+#include <Eigen/Core.h>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+template<typename Scalar, typename Derived>
+Eigen::Cast<double, Derived>
+castToDouble(const MatrixBase<Scalar, Derived>& m)
+{
+  return Eigen::Cast<double, Derived>(m.ref());
+  // note: tempting as it is, writing "m.cast<double>()" here
+  // causes a compile error with g++ 4.2, apparently due to
+  // g++ getting confused by the many template types and
+  // template arguments involved.
+}
+
+int main(int, char**)
+{
+  Matrix2i m = Matrix2i::random();
+  cout << "Here's the matrix m. It has coefficients of type int."
+       << endl << m << endl;
+  cout << "Here's 0.05*m:" << endl << 0.05 * castToDouble(m) << endl;
+  return 0;
+}
diff --git a/doc/examples/class_Column.cpp b/doc/examples/class_Column.cpp
new file mode 100644
index 000000000..ec8628ab7
--- /dev/null
+++ b/doc/examples/class_Column.cpp
@@ -0,0 +1,19 @@
+#include <Eigen/Core.h>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+template<typename Scalar, typename Derived>
+Eigen::Column<Derived>
+firstColumn(MatrixBase<Scalar, Derived>& m)
+{
+  return m.col(0);
+}
+
+int main(int, char**)
+{
+  Matrix4d m = Matrix4d::identity();
+  cout << firstColumn(m) << endl;
+  firstColumn(m) *= 5;
+  cout << "Now the matrix m is:" << endl << m << endl;
+  return 0;
+}
diff --git a/doc/examples/class_DynBlock.cpp b/doc/examples/class_DynBlock.cpp
index 8407d8733..3a8b607da 100644
--- a/doc/examples/class_DynBlock.cpp
+++ b/doc/examples/class_DynBlock.cpp
@@ -1,10 +1,10 @@
 #include <Eigen/Core.h>
-USING_EIGEN_DATA_TYPES
+USING_PART_OF_NAMESPACE_EIGEN
 using namespace std;
 
 template<typename Scalar, typename Derived>
 Eigen::DynBlock<Derived>
-topLeftCorner(const Eigen::MatrixBase<Scalar, Derived>& m, int rows, int cols)
+topLeftCorner(MatrixBase<Scalar, Derived>& m, int rows, int cols)
 {
   return m.dynBlock(0, 0, rows, cols);
 }
diff --git a/doc/examples/class_Row.cpp b/doc/examples/class_Row.cpp
new file mode 100644
index 000000000..70a388015
--- /dev/null
+++ b/doc/examples/class_Row.cpp
@@ -0,0 +1,19 @@
+#include <Eigen/Core.h>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+template<typename Scalar, typename Derived>
+Eigen::Row<Derived>
+firstRow(MatrixBase<Scalar, Derived>& m)
+{
+  return m.row(0);
+}
+
+int main(int, char**)
+{
+  Matrix4d m = Matrix4d::identity();
+  cout << firstRow(m) << endl;
+  firstRow(m) *= 5;
+  cout << "Now the matrix m is:" << endl << m << endl;
+  return 0;
+}
-- 
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