function numberOfRealZerosAndPoles_zp
  import Modelica_LinearSystems2.DataDir;
  input String fileName = DataDir + "/zp.mat" "Name of the zeros and poles data file" annotation(
    Dialog(loadSelector(filter = "MAT files (*.mat);; All files (*.*)", caption = "state space system data file")));
  input Real eps = Modelica.Constants.eps;
  output Integer n1n2d1d2[4];
end numberOfRealZerosAndPoles_zp;