General response formulae for Fornasini-Marchesini's models with variable coefficients

Fornasini-Marchesini's models, Roesser's model and general 2-D system model with variable coefficients are considered. A new definition of the transition matrix for the second Fornasini-Marchesini's model with variable coefficients is presented. General response formulae for first and second Fornasini-Marchesini's models with variable coefficients are derived.