1 #include <Eigen/Dense>
2 #include <iostream>
3 
4 using namespace std;
5 
main()6 int main()
7 {
8   Eigen::MatrixXf m(3,3);
9   m << 1,2,3,
10        4,5,6,
11        7,8,9;
12   cout << "Here is the matrix m:" << endl << m << endl;
13   cout << "2nd Row: " << m.row(1) << endl;
14   m.col(2) += 3 * m.col(0);
15   cout << "After adding 3 times the first column into the third column, the matrix m is:\n";
16   cout << m << endl;
17 }
18