1 #include <iostream> 2 #include <Eigen/Dense> 3 4 using namespace std; 5 using namespace Eigen; 6 main()7 int main() 8 { 9 Eigen::MatrixXf m(2,4); 10 Eigen::VectorXf v(2); 11 12 m << 1, 23, 6, 9, 13 3, 11, 7, 2; 14 15 v << 2, 16 3; 17 18 MatrixXf::Index index; 19 // find nearest neighbour 20 (m.colwise() - v).colwise().squaredNorm().minCoeff(&index); 21 22 cout << "Nearest neighbour is column " << index << ":" << endl; 23 cout << m.col(index) << endl; 24 } 25