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.