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New in Mathematica 9Enhanced Control Systems

Descriptor Systems 

Just like time-delay systems, descriptor systems are also fully integrated into Mathematica.

Obtain a descriptor state-space model from a differential-algebraic equation.

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A descriptor state-space model constructed from the state, input, output, transmission, and descriptor matrices.

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A descriptor state-space model from an improper transfer-function model.

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Construct a discrete-time descriptor system by specifying a sampling period.

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Tight integration allows workflows for descriptor systems to match those of standard or proper systems.

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If the descriptor matrix is nonsingular, the system can be converted to a standard state-space representation.

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