MATLAB CONTROL SYSTEM TOOLBOX 9 Guida Utente Scaricare il pdf (Pagina 588)

100

101

set

11-198

Remark For discrete-time transfer functions, the convention used to represent the

numerator anddenominatordepends onthe choice ofvariable (see the

tf entry

for details). Like

tf,thesyntaxforset changes to remain consistent with the

choice of variable. For example, if the

Variable property is set to 'z' (the

default),

set(h,'num',[1 2],'den',[1 3 4])

produces the transfer function

However, if you change the

Variable to 'z^–1' (or 'q')by

set(h,'Variable','z^–1'),

the same command

set(h,'num',[1 2],'den',[1 3 4])

now interprets the row vectors [1 2] and [1 3 4] as the polynomials

and and produces:

Table 11-19: FRD Model Properties

Property Name Admissible Property Values

Frequency

Real-valued vector of length -by-1, where is the number of

frequencies

Response

• -by- -by- -dimensional arrayof complexdata forsingle LTImodels

• -by- -by--by- -by- -by- -dimensional array for LTI arrays

Units

String 'rad/s' (default), or 'Hz'

…

hz()

z 2

3z 4++

----------------------------=

12z

–

13z

–

1 2 ... 583 584 585 586 587 588 589 590 591 592 593 ... 648 649

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guida Utente Pagina 588

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