Specifications

Building LTI Arrays
5-17
Notice that this result is very different from the single MIMO LTI model
returned by
H = [H11,H12;H21,H22];
Building LTI Arrays Using tf, zpk, ss, and frd
You can also build LTI arrays using the tf, zpk, ss,andfrd constructors. You
do this by using multidimensional arrays in the input arguments for these
functions.
Specifying Arrays of TF models tf
For TF models, use
sys = tf(num,den)
where
•Both
num and den are multidimensional cell arrays the same size as sys (see
“size and ndims” on page 4-9).
•
sys(i,j,n1,...,nK) is the (i, j) entry of the transfer matrix for the model
located in the position of the array.
•
num(i,j,n1,...,nK) isarowvectorrepresentingthenumeratorpolynomial
of
sys(i,j,n1,...,nK).
•
den(i,j,n1,...,nK) is a row vector representing denominator polynomial
of
sys(i,j,n1,...,nK).
See “MIMO Transfer Function Models” on page 2-10 for related information on
the specification of single TF models.
Specifying Arrays of ZPK Models Using zpk
For ZPK models, use
sys = zpk(zeros,poles,gains)
where
•Both
zeros and poles are multidimensional cell arrays whose cell entries
containthevectorsofzerosandpolesforeachI/Opairofeachmodelinthe
LTI array.
n
1
…
n
K
,,()