• Graphical User Interface.
• Action Recorder to make GUI-based demos and tests.
• Smooth transfer of models to the Control System Toolbox via objects.
• Automatic model scan. This allows a completely automatic modeling procedure so that even unfamiliar users can get reasonable models. This can be an important advantage in thecompetition with any other modeling package.
• Incorporation of orthogonal polynomials into the identification scheme. This allows the user to handle high-order resonant systems, like mechanical systems in modal analysis. A user request since years.
• Dealing with transients in the measured signals. Up to now only periodic signals were properly handled in the frequency domain.
• Simpler and more logical alternative command-line call forms. The earlier forms still stem from Matlab 3.5, they are somewhat awkward and even frightening for some users.

A detailed description of the GUI and of the objects is readable in an HTML document. For printing, zipped postscript pages of the paper are also available (very large postscript files!).

There is no separate printed manual for the Extension. It is fully compatible with the commercially distributed version of the Toolbox, so the functionalities of the individual functions can be studied there. The new, simple function call forms are given by the command fdhelp, the GUI contains extensive on-line helps, and the objects also have their own on-line help.

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