func int main() {
  matrix a <3, 3>;
  matrix sum_r<3,1>;
  matrix sum_c<1,3>;
  a = [1.1, 1.2, 1.3; 1.0, 1.4, 1.0; 1.0, 1.0, -1.0];
  sum_r = sum_row(a);
  print(sum_r);
  sum_c = sum_col(a);
  print(sum_c);
  return 0;
}