functioneigenVectors

Information

Syntax

Description

Calculate the eigenvectors and optionally (onlyEigenvectors=false) the eigenvalues of a state space system. The output eigenvectors is a matrix with the same dimension as matrix ss.A. Just like in Modelica.Math.Matrices.eigenValues, if the i-th eigenvalue has an imaginary part, then eigenvectors[:,i] is the real and eigenvectors[:,i+1] is the imaginary part of the eigenvector of the i-th eigenvalue.
The eigenvalues are returned as a complex vector eigenvalues.

Example

     Modelica_LinearSystems2.StateSpace ss=Modelica_LinearSystems2.StateSpace(
        A=[-1,1;-1,-1],
        B=[1;1],
        C=[1,1],
        D=[0]);

     Real eigenvectors[2,2];
     Complex eigenvalues[2];

  algorithm
    (eigenvectors, eigenvalues) = Modelica_LinearSystems2.StateSpace.Analysis.eigenVectors(ss, true);
  // eigenvectors = [0.707, 0; 0, 0.707]
  // eigenvalues = {-1 + 1j, -1 - 1j}

            |0.707 |         | 0.707 |
  i.e. v1 = |      |,   v2 = |       |
            |0.707i|         |-0.707i|
  

Inputs

Outputs