RARL2 is a matlab toolbox. Its goal is to provide  a stable rational L2 -approximation of prescribed order to a  H2 matrix-valued function  given in one of the following forms

  • a finite number of Fourier coefficients
  • a state-space realization
  • sampled values on the unit circle (frequency data).

It can be used for model reduction, identification from frequency data, pole recovery. It works for MIMO systems.
The optimization method is based on the following points

  • the optimization range is reduced to a compact set
  • a parametrization of stable all-pass systems is used which guarantees:
    • stability of the approximant
    • degree control
    • well-conditionning

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