User`s guide

1 Quick Start
1-10
Model Characteristics
The Control System Toolbox contains commands to query such model
characteristics as the I/O dimensions, poles, zeros, and DC gain. See “General
Model Characteristics” on page 5-2 for more information. These commands
apply to both continuous- and discrete-time model. Their LTI-based syntax is
summarized below (with
sys denoting an arbitrary LTI model).
size(sys) % number of inputs, outputs, and array dimensions
ndims(sys) % number of dimensions
isct(sys) % returns 1 for continuous systems
isdt(sys) % returns 1 for discrete systems
hasdelay(sys) % true if system has delays
pole(sys) % system poles
zero(sys) % system (transmission) zeros
dcgain(sys) % DC gain
norm(sys) % system norms (H2 and Linfinity)
covar(sys,W) % covariance of response to white noise
pade(sys) % Pade approximation of input delays