MATLAB CONTROL SYSTEM TOOLBOX 9 Guida Utente Scaricare il pdf (Pagina 78)

100

101

2 LTI Models

2-34

prod uces

ans =

'u'

Any valid syntax for structures extends to LTI objects. For example, given the

TF model

h = tf(1,[1,0],'variable','p');

you can reset the numerator to by typing

h.num{1} = [1 2];

or equivalently, with

h.num{1}(2) = 2;

Additional Insight into LTI Properties

By reading t his section, you can learn more about using the Ts, InputName,

OutputName, InputGroup,andOutputGroup L TI properties t hrough a set of

examples. For basic information on

Notes and Userdata, see “Generic

Properties” on page 2-26. For detailed information on the use of

InputDelay,

OutputDelay

,andioDelayMatrix, see “Ti m e D elays” on page 2-45.

Sample Time

ThesampletimepropertyTs is usedto specifythe sampling period(in seconds)

for either discrete-time or discretized continuous-time LTI models. Suppose

you want to specify

as a discrete-time transfer function model with a sampling period of 0.5

second s. To d o this, type

h = tf([1 0],[2 1 1],0.5);

()

⁄=

p 2

Hz()

z 1++

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

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 648 649

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guida Utente Pagina 78

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