MATLAB CONTROL SYSTEM TOOLBOX 9 Uživatelská příručka stáhnout pdf (Strana 152)

100

101

4 Arrays of LTI Models

4-20

Indexing Into LTI Arrays

You can index into LTI arrays in much the same way as y ou would for

multidimensional arrays to:

• Access models

• Extract subsystems

• ReassignpartsofanLTIarray

•Delete parts of an LTI array

When you index into an LTI array

sys, the indices should be organized

according to t he following format

where

•

Outputs are indices that select output channels.

•

Inputs are indices that select input channels.

• are indices into the array dimensions that select one model or a

subset of models in the LTI array.

Note on Indexing into LTI Arrays of FRD models: For FRD models, the

array indices can be followed by the keyword

'frequency' and some

expression selecting a subset of the frequency points as in

sys (outputs, inputs, n1,...,nk, 'frequency', SelectedFreqs)

See “Re ferencing FRD Models Through Frequencies” on page 3-7 for details on

frequency point selection in FRD models.

Accessing Particular Models in an LTI Array

To access any given model in an LTI array:

• Use colon arguments (

:,:) for the first two indices to select all I/O channels.

• The remaining indices specify the model coordinates within the array.

sys(Outputs, Inputs, )n

… n

…n

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 648 649

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