Subtract two zeros and poles descriptions (zp1 - zp2)
function subtract import Modelica; import Modelica_LinearSystems2.ZerosAndPoles; import Modelica_LinearSystems2.Math.Polynomial; import Complex; input ZerosAndPoles zp1 "Zeros-and-poles data record 1"; input ZerosAndPoles zp2 "Zeros-and-poles data record 2"; end subtract;