Specifications

2 LTI Models
2-6
sys = sys1 + sys2
because parallel connection amounts to adding the transfer matrices.
Similarly, subsystems of a given LTI model
sys can be extracted using
matrix-like subscripting. For instance,
sys(3,1:2)
provides the I/O relation between the first two inputs (column indices) and the
third output (row index), which is consistent with
for .
Command Summary
The next two tables give an overview of the main commands you can apply to
LTI models.
Table 2-1: Creating LTI Models
Command Description
drss
Generate random discrete state-space model.
dss
Create descriptor state-space model.
filt
Create discrete filter with DSP convention.
frd
Create an FRD model.
frdata
Retrieve FRD model data.
get
Query LTI model properties.
set
Set LTI model properties.
rss
Generate random continuous state-space model.
ss
Create a state-space model.
y
1
y
2
y
3
H 11
,()
H 21
,()
H 21
,()
H 22
,()
H 31
,()
H 32
,()
u
1
u
2
=
yHu=