#include <iostream>#include "mtl/utils.h"#include "mtl/mtl.h"#include "mtl/linalg_vec.h"/*  Sample output;X: [1,2,3,4,]The L-1 norm of X is 10    */using namespace mtl;intmain(){  double x_[4] = { 1, 2, 3, 4 };    double s = one_norm(array_to_vec(x_));  std::cout << "X: ";  print_vector(array_to_vec(x_));  std::cout << "The L-1 norm of X is " << s << std::endl;}