Add second example to QuickStart guide.

Also, some changes suggested by Keir and Benoit on mailing list.

3 files changed, 36 insertions, 4 deletions

diff --git a/doc/examples/QuickStart_example.cpp b/doc/examples/QuickStart_example.cpp
index 5337f0f4f..3fbd6fab2 100644
--- a/doc/examples/QuickStart_example.cpp
+++ b/doc/examples/QuickStart_example.cpp
@@ -2,12 +2,14 @@
 #include <Eigen/Dense>
 
 using Eigen::MatrixXd;
+using Eigen::VectorXd;
 
 int main(int, char *[])
 {
-  MatrixXd m(2,3);
-  m(0,0) = -3;
-  m(1,0) = 1.5;
-  m.rightCols(2) = MatrixXd::Identity(2,2);
+  MatrixXd m(2,2);
+  m(0,0) = 3;
+  m(1,0) = 2.5;
+  m(0,1) = -1;
+  m(1,1) = m(1,0) + m(0,1);
   std::cout << 2*m << std::endl;
 }
diff --git a/doc/examples/QuickStart_example2_dynamic.cpp b/doc/examples/QuickStart_example2_dynamic.cpp
new file mode 100644
index 000000000..c304c934a
--- /dev/null
+++ b/doc/examples/QuickStart_example2_dynamic.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+#include <Eigen/Dense>
+
+using Eigen::MatrixXd;
+using Eigen::VectorXd;
+
+int main(int, char *[])
+{
+  MatrixXd m(3,3);
+  for (int rowIndex = 0; rowIndex < 3; ++rowIndex)
+    for (int columnIndex = 0; columnIndex < 3; ++columnIndex)
+      m(rowIndex, columnIndex) = rowIndex + 0.01 * columnIndex;
+  VectorXd v = VectorXd::Ones(3);
+  std::cout << m * v << std::endl;
+}
diff --git a/doc/examples/QuickStart_example2_fixed.cpp b/doc/examples/QuickStart_example2_fixed.cpp
new file mode 100644
index 000000000..6d7d63d15
--- /dev/null
+++ b/doc/examples/QuickStart_example2_fixed.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+#include <Eigen/Dense>
+
+using Eigen::Matrix3d;
+using Eigen::Vector3d;
+
+int main(int, char *[])
+{
+  Matrix3d m;
+  for (int rowIndex = 0; rowIndex < 3; ++rowIndex)
+    for (int columnIndex = 0; columnIndex < 3; ++columnIndex)
+      m(rowIndex, columnIndex) = rowIndex + 0.01 * columnIndex;
+  Vector3d v = Vector3d::Ones();
+  std::cout << m * v << std::endl;
+}