Definition:
class ltu
{
public:
// build objects
bool need_norm;
int transfers_type = 1;
int nbX;
int nbY;
int nbParams;
arma::mat lambda;
arma::mat phi;
arma::mat aux_zeta; // could be 1 - lambda_LTU;
arma::mat aux_phi_exp; // aux_phi_exp = exp(phi); will probably end up as exp(phi / sigma) when using MFE, K_LTU
// member functions
void build(const arma::mat& lambda_LTU, const arma::mat& phi_LTU, bool need_norm_LTU);
void trans();
//
// MFE-related functions
arma::mat M(const arma::mat& a_xs, const arma::mat& b_ys) const;
arma::mat M(const arma::mat& a_xs, const arma::mat& b_ys, arma::uvec* xs, arma::uvec* ys) const;
arma::mat M(const double& a_xs, const arma::mat& b_ys, arma::uvec* xs, arma::uvec* ys) const;
arma::mat M(const arma::mat& a_xs, const double& b_ys, arma::uvec* xs, arma::uvec* ys) const;
arma::mat Mx0(const arma::mat& a_x) const;
arma::mat M0y(const arma::mat& b_y) const;
};
Example: