MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 75)

100

101

LTI Properties

2-31

For example, you can specify the delay directly when you create the model, and

then use the

set command to assign InputName, OutputName,andNotes to

sys

sys = tf(1,[1 1],'Inputdelay',0.3);

set(sys,'inputname','energy','outputname','temperature',...

'notes','A simple heater model')

Finally, you can also use the set command to obtain a listing of all settable

properties for a given LTI model type, along with valid values for these

properties. For the transfer function

sys created above

set(sys)

produces

num: Ny-by-Nu cell of row vectors (Nu = no. of inputs)

den: Ny-by-Nu cell of row vectors (Ny = no. of outputs)

Variable: [ 's' | 'p' | 'z' | 'z^-1' | 'q' ]

Ts: scalar

InputDelay: Nu-by-1 vector

OutputDelay: Ny-by-1 vector

ioDelayMatrix: Ny-by-Nu array (I/O delays)

InputName: Nu-by-1 cell array of strings

OutputName: Ny-by-1 cell array of strings

InputGroup: M-by-2 cell array if M input groups

OutputGroup: P-by-2 cell array if P output groups

Notes: array or cell array of strings

UserData: arbitrary

Accessing Property Values Using get

You access the property values of an LTI model sys with get. The syntax is

PropertyValue = get(sys,PropertyName)

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