Some of its functionality is not available elsewhere, however. This relates mostly to the "British school" of multivariable feedback design of the 1970's, associated principally with the names of Professors Rosenbrock and MacFarlane. This functionality relates mostly to the Inverse Nyquist Array and Characteristic Locus design methods.
MFD Version 3 (for use with Matlab 4.2) included some new GUI facilities for multivariable feedback design and for fitting parametric (state-space and transfer function) models to multivariable frequency-response data. However this version never got beyond Alpha testing.
The MFD Toolbox builds on Matlab to provide tools for control engineers working with multivariable feedback systems. Modern methods of robust feedback design, such as H-infinity, mu-synthesis, and LQG/LTR, emphasise the analysis of frequency response properties of systems, even in the multivariable case. The MFD Toolbox concentrates on making it easy to compute, visualise, analyse, and manipulate frequency responses of multivariable systems. In this respect it complements other Matlab toolboxes for control engineering. Jan Maciejowski is the principal author of the MFD Toolbox, which was a product of Cambridge Control Ltd, now part of The Mathworks. As far as I know, it is no longer available commercially.
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This page last updated on 22 May 2003.