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third_party/eigen/doc/examples/QuickStart_example2_fixed.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+using Eigen::Matrix3d;
+using Eigen::Vector3d;
+
+int main() {
+  Matrix3d m = Matrix3d::Random();
+  m = (m + Matrix3d::Constant(1.2)) * 50;
+  std::cout << "m =" << std::endl << m << std::endl;
+  Vector3d v(1, 2, 3);
+
+  std::cout << "m * v =" << std::endl << m * v << std::endl;
+}