MATLAB CONTROL SYSTEM TOOLBOX 9 Podręcznik Użytkownika Pobierz pdf (Strona 73)

100

101

LTI Properties

2-29

Most of these properties are dedicated to storing the model data. Note that the

matrix is set to

[] (the empty matrix) for standard state-space models, a

storage-efficie nt shorthand for the true value .

The

Variable property is only an attrib ute of TF and ZPK objects. This

property defines the frequency variable of transfer functions. The default

values are

's' (Laplace variable ) in continuous time and 'z' (Z-transform

variable ) in d iscrete time. Alternative choices include

'p' ( eq uiv al e n t to )

and

'q' or 'z^–1' for the reciprocal ofthe variable. The influence of

the variable choice is mostly limited to the display of TF or ZPK models. One

exception isthe specification ofdiscrete-time transferfunctionswith

tf (seetf

on page 11-224 for details).

Note that

tf producesthesameresultasfilt when the Variable property is

set to

'z^–1' or 'q'.

Finally, the

StateName propertyis analogoustotheInputName andOutputName

properties and keeps track of the state names in state-space models.

Descriptor matrix 2-D real matrix

StateName

State names Cell vector of strings

Table 2-8: FRD-Specific Properties

Property Name Description Property Value

Frequency

Frequency data points Real-valued vector

ResponseData

Frequency response Complex-valued

multidimensional array

Units

Units for frequency String 'rad/s' or 'Hz'

Table 2-7: SS-Specific Properties (Continued)

Property Name Description Property Value

–

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 648 649

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