Initial commit

external/eigen-3.4.0/doc/examples/tut_matrix_resize.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+using namespace Eigen;
+
+int main()
+{
+  MatrixXd m(2,5);
+  m.resize(4,3);
+  std::cout << "The matrix m is of size "
+            << m.rows() << "x" << m.cols() << std::endl;
+  std::cout << "It has " << m.size() << " coefficients" << std::endl;
+  VectorXd v(2);
+  v.resize(5);
+  std::cout << "The vector v is of size " << v.size() << std::endl;
+  std::cout << "As a matrix, v is of size "
+            << v.rows() << "x" << v.cols() << std::endl;
+}