Multiply two discrete transfer functions (dtf1 * dtf2)
function 'dtf*dtf' import Modelica; import Modelica_LinearSystems2.Math.Polynomial; import Modelica_LinearSystems2.DiscreteTransferFunction; input DiscreteTransferFunction dtf1 "Transfer function system 1"; input DiscreteTransferFunction dtf2 "Transfer function system 1"; output DiscreteTransferFunction result; end 'dtf*dtf';