.Modelica_LinearSystems2.DiscreteZerosAndPoles.Analysis.evaluate

Information

Syntax

result = DiscreteZerosAndPoles.Analysis.evaluate(dzp,q)

Description

Function Analysis.evaluate evaluates the DiscreteZerosAndPoles transfer function at a given (complex) value of q. The transfer function G(z)=N(q)/D(q) is evaluated by calculating the numerator polynomial N(z) and the denominator polynomial D(q).

Example

  import Modelica.ComplexMath.j;
  DiscreteZerosAndPoles q = Modelica_LinearSystems2.DiscreteZerosAndPoles.q();
  Modelica_LinearSystems2.DiscreteZerosAndPoles dzp=(q+1)/(q^2+q+1);

  Complex result;

algorithm
  result := Modelica_LinearSystems2.DiscreteZerosAndPoles.Analysis.evaluate(dzp, j+1);
//  result = 0.538462 - 0.307692*j

See also

Math.Polynomial.evaluateComplex

Interface

encapsulated function evaluate
  import Modelica;
  import Modelica.ComplexMath.j;
  import Complex;
  import Modelica_LinearSystems2;
  import Modelica_LinearSystems2.DiscreteZerosAndPoles;
  import Modelica_LinearSystems2.ZerosAndPoles;
  input DiscreteZerosAndPoles dzp "DiscreteZerosAndPoles transfer function of a system";
  input Complex q = Complex(0) "Complex value q where dzp is evaluated";
  input Real den_min = 0 "|denominator(p)| is limited by den_min";
  output Complex y "= zp(p)";
end evaluate;