26 Index order,
const std::map<Index, Eigen::VectorXd>& map)
const {
27 if (map.count(order) == 0) {
28 std::string keys =
"{ ";
29 for (
const auto& pair : map) {
30 keys += std::to_string(pair.first) +
" ";
33 throw std::invalid_argument(
"Order " + std::to_string(order) +
" not in " +
36 " select one of these numbers");