Code: advanced

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## Additional uses of the toolbox
The toolbox provides additional utility related to flow control:
* Compute dynamic operators A, B, C, D and mass matrix E,
* Restart a simulation from a saved file,
* Define an arbitrary number of actuators and sensors (e.g. feedback and performance sensors),
* Export time series (measurements from sensors, perturbation kinetic energy...) and fields for visualization,
* Modify the equations, the numerical schemes and the solvers used for the time simulation,
* Leverage parallel execution native to FEniCS,
* Use it as backend in an optimization tool (as in [Jussiau, W., Demourant, F., Leclercq, C., & Apkarian, P. (2025). Control of a Class of High-Dimensional Nonlinear Oscillators: Application to Flow Stabilization. IEEE Transactions on Control Systems Technology.](https://ieeexplore.ieee.org/abstract/document/10884641/)).