User`s guide

Subreferencing Model Objects
Thus, linear, pa ram etric models represent input-output relationships for two
kinds of input channels: measured inputs and (unmeasured) noise inputs. For
example, consider the ARX model given by one of the following equations:
Aqyt Bqut nk et()() () ()=−
()
+
or
yt
Bq
Aq
ut
Aq
et()
()
() ()
()=
()
+
1
In this case, the dynamic m odel is the relationship between the measured
input u and output y,
G
Bq
Aq
=
()
()
. The noise model is the contribution of the
input noise e to the output y,givenby
H
Aq
=
1
()
.
Suppose that the model
m contains both a dynamic model G and a noise model
H. To create a new model by subreferencing G due to measured inputs, use
the following syntax:
m_G = m('measured')
Tip Altern a tively, you can use the followin g shortha nd synta x: m_G = m ('m' )
3-121