TransferFunctionModel[m, s] represents the model of the transfer-function matrix m with complex variable s. TransferFunctionModel[{num, den}, s] specifies the numerator num ...

GainMargins[lsys] gives the gain margins of the linear time-invariant system lsys.

PhaseMargins[lsys] gives the phase margins of the linear time-invariant system lsys.

SamplingPeriod is an option to StateSpaceModel etc. that specifies the sampling period.

TransferFunctionTransform[f, tf] transforms the TransferFunctionModel object tf using the transformation function f.

SystemsModelLabels is an option to StateSpaceModel etc. that specifies labels of variables.

TransferFunctionFactor[tfm] factors the polynomial terms in the numerators and denominators of the TransferFunctionModel tfm.

ContinuousTimeModelQ[lsys] gives True if lsys is a continuous-time systems model, and False otherwise.

DiscreteTimeModelQ[lsys] gives True if lsys is a discrete-time systems model, and False otherwise.

SmithDelayCompensator[sys, con] gives the Smith compensator for the time-delay system sys and the delay-free controller con.