控制

Currently, sympy.physics.control is able to deal with LTI (Linear, time-invariant) systems. The TransferFunction class is used to represent Continuous-time Transfer functions in the Laplace domain; where Transfer functions are input to output representations of dynamic systems. The additive property is used for transfer functions in the Parallel class, and the multiplicative property is used for transfer functions in the Series class. Also, there is a Feedback class which is used to represent negative feedback interconnection between two input/output systems. MIMO systems are also supported with TransferFunctionMatrix as the base class for representing one. MIMOSeries, MIMOParallel and MIMOFeedback are MIMO equivalent of Series, Parallel and Feedback classes.

这种符号控制系统包的优点是，从中得到的解是非常精确的，并且不依赖于数值方法来近似解。所得到的符号解也是紧凑形式，可用于进一步分析。