Control System Toolbox Release Notes

Chapter 3
Control System Toolbox 6.0 Release Notes

New Features

This section summarizes the new features and enhancements introduced in the Control System Toolbox 6.0.

If you are upgrading from a release earlier than Release 13.0, then you should see New Features in the Control System Toolbox 5.2 Release Notes.

Linearization Tools Moved to Simulink Control Design

The LTI Viewer interface with the Simulink linearization tools has been moved to Simulink Control Design. The slview command now launches the Linear Analysis Tool in Simulink Control Design

Enhanced Numerical Algorithms

The numerical engine has been overhauled to leverage the state-of-the-art LAPACK and SLICOT libraries, resulting in faster and more accurate computations. This upgrade benefits the following areas:

• Computation of system zeros (zero, ss to tf or zpk conversions)
• Lyapunov and Riccati solvers (lyap, dlyap, care, dare)
• Model order reduction (balreal and modred)

and also introduced several new foundation algorithms, including

• Square-root solvers for stable Lyapunov equations (lyapchol and dlyapchol)
• Block diagonalization algorithm (bdschur)
• Commands for reordering eigenvalues in Schur decompositions (ordschur and ordqz). These commands are part of MATLAB.

Improved Support for Model Order Reduction

The support for model order reduction has been significantly improved:

• balreal now leverages the new square-root Lyapunov solvers for greater robustness, accuracy, and performance
• Reduction of unstable or marginally stable systems is now supported

New Commands for Modal Decompositions

New commands have been added for additive modal decompositions:

• stabsep separates the stable and unstable modes of a system
• modsep performs modal decompositions into N arbitrary regions

Platform Limitations for HP

Major Bug Fixes

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