Specifications

LTI Properties
2-29
The function set for LTI objects follows the same syntax as its Handle
Graphics counterpart. Specifically, each property is updated by a pair of
arguments
PropertyName,PropertyValue
where
•
PropertyName is a string specifying the property name. You can type the
property name without regard for the case (upper or lower) of the letters in
the name. Actually, you need only type any abbreviation of the property
namethat uniquely identifies the property. For example,
'user' issufficient
to refer to the
Userdata property.
•
PropertyValue is the value to assign to the property (see set for details on
admissible property values).
As an illustration, consider the following simple SISO model for a heating
system with an input delay of 0.3 seconds, an input called “energy,” and an
output called “temperature.”
Figure 2-1: A Simple Heater Model
You can use a TF object to represent this delay system, and specify the time
delay, the input and output names, and the model history by setting the
corresponding LTI properties
. You can either set these properties directly
when you create the LTI model with
tf,orbyusingtheset command.
For example, you can specifythe delay directly when youcreatethe model, and
then use the
set command to assign InputName, OutputName,andNotes to
sys
.
sys = tf(1,[1 1],'Inputdelay',0.3);
set(sys,'inputname','energy','outputname','temperature',...
'notes','A simple heater model')
1
s 1+
------------
e
0.3s–
delay
energy
temperature