Specifications

General Model Characteristics
4-3
General Model Characteristics
General model characteristics include the model type, I/O dimensions,
and continuous or discrete nature. Related commands are listed in the
table below. These commands operate on continuous- or discrete-time
LTI models or arrays of LTI models of any type.
This example illustrates the use of some of these commands. See the
related reference pages for more details.
H = tf({1 [1 –1]},{[1 0.1] [1 2 10]})
Transfer function from input 1 to output:
1
-------
s + 0.1
General Model Characteristics Commands
class
Display model type ('tf', 'zpk', 'ss',or'frd').
hasdelay
Test true if LTI model has any type of delay.
isa
Test true if LTI model is of specified class.
isct
Test true for continuous-time models.
isdt
Test true for discrete-time models.
isempty
Test true for empty LTI models.
isproper
Test true for proper LTI models.
issiso
Test true for SISO models.
ndims
Display the number of model/array dimensions.
reshape
Change the shape of an LTI array.
size
Output/input/array dimensions. Used with special
syntax,
size also returns the number of state
dimensions for state-space models, and the number
of frequencies in an FRD model.