MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 149)

100

101

Building LTI Arrays

4-17

% Set up the LTI array using stack.

COL1 = stack(1,H11,H21); % The first column of the 2-by-2 array

COL2 = stack(1,H12,H22); % The second column of the 2-by-2 array

H = stack(2, COL1, COL2); % Concatenate the two columns of models.

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 s ize as sys (see

“size and nd ims” on p age 4-9).

•

sys(i,j,n1,...,nK) is the (i, j) entry of the transfer matrix for the model

located i n the position of the array.

•

num(i,j,n1,...,nK) is a rowvector representing thenumeratorpolynomial

sys(i,j,n1,...,nK).

•

den(i,j,n1,...,nK) is a row vector representing denominator polynomial

sys(i,j,n1,...,nK).

See “MIM O T ransf er F unction Models” on page 2- 10 f or related information o n

the specification of single TF models.

Specifying Arrays of ZPK Models Using zpk

For ZPK models, use

sys = zpk(zeros,poles,gains)

…

,,()

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 648 649

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