Model Characteristics

You can use the Control System Toolbox™ commands to query model characteristics such as the I/O dimensions, poles, zeros, and DC gain. These commands apply to both continuous- and discrete-time models. Their LTI-based syntax is summarized in the table below.

Commands to Query Model Characteristics

Command	Description
size(model_name)	Number of inputs and outputs
ndims(model_name)	Number of dimensions
isct(model_name)	Returns 1 for continuous systems
isdt(model_name)	Returns 1 for discrete systems
hasdelay(model_name)	True if system has delays
pole(model_name)	System poles
zero(model_name)	System (transmission) zeros
dcgain(model_name)	DC gain
norm(model_name)	System norms (H2 and L∞)
covar(model_name,W)	Covariance of response to white noise
bandwidth(model_name)	Frequency response bandwidth
order(model_name)	LTI model order
pzmap(model_name)	Compute pole-zero map of LTI models
damp(model_name)	Natural frequency and damping of system poles
class(model_name)	Create object or return class of object
isa(model_name)	Determine whether input is object of given class
isempty(model_name)	Determine whether LTI model is empty
isproper(model_name)	Determine whether LTI model is proper
issiso(model_name)	Determine whether LTI model is single-input/single-output (SISO)
isstable(model_name)	Determine whether system is stable
reshape(model_name)	Change shape of LTI array