Initial commit

Eigen3/doc/examples/QuickStart_example2_dynamic.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+using namespace Eigen;
+using namespace std;
+
+int main()
+{
+  MatrixXd m = MatrixXd::Random(3,3);
+  m = (m + MatrixXd::Constant(3,3,1.2)) * 50;
+  cout << "m =" << endl << m << endl;
+  VectorXd v(3);
+  v << 1, 2, 3;
+  cout << "m * v =" << endl << m * v << endl;
+}