MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 113)

100

101

Extracting and Modifying Subsystems

3-9

is equivalent to

sys(1,[2 4 5]

Similarly, if pressure isthenameassignedtoanoutputchanneloftheLTI

model

sys,then

sys('pressure',1) = tf(1, [1 1])

reassigns the subsystem from the first i nput of sys to the output labeled

pressure.

You ca n reference a set of channels by input or output name by using a cell

array of strings for the names. For example, if

sys has one output channel

named

pressure and one named temperature,thent hese two output channels

can b e referenced using

sys({'pressure','temperature'})

Resizing LTI Systems

Resizing a system consists of adding or deleting inputs and/or outputs. To

delete the first two inputs, simply type

sys(:,1:2) = []

In deletions, at least one of the row/column indexes should be the colon (:)

selector.

To perform input/output augmentation, you can proceed by concatenat ion or

subassignment. Given a system

sys with a single input, you can add a second

input using

sys = [sys,h];

or, equivale ntly, using

sys(:,2) = h;

where h is any LTI model wit h one input, and the same numb er of outputs as

sys. There is an important difference between these two options: while

concatenationobeystheprecedencerules(seepage2-5),subsystemassignment

does not alter the model type. So, if

sys and h are TF and SS o bjects,

respectively, the first statement produces a state-space model, and t he second

statement produces a transfer function.

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