MATLAB CONTROL SYSTEM TOOLBOX 9 Betriebsanweisung PDF herunterladen (Seite 112)

100

101

3 Operations on LTI Models

3-8

I/O channel or g roup names) as a keyword. There are two ways you can specify

FRD models using frequencies:

• Using integers to index into the frequency vector of the FRD model

• Usinga Boolean(logical)expressiontospecifydesired frequencypoints inan

FRD model

For example, if

sys is an FRD model with five frequencies, (e.g.,

sys.Frequency=[1 1.1 1.2 1.3 1.4]), then you can create a new FRD model

sys2 by indexing into the frequencies of sys as follows.

sys2 = sys('frequency', 2:3);

sys2.Frequency

ans =

1.1000

1.2000

displays the second and third entries in the frequency v ector.

Similarly, you can use logical indexing into the frequencies.

sys2 = sys('frequency',sys.Frequency >1.0 & sys.Frequency <1.15);

sys2.freq

ans =

1.1000

You can also combine model extraction through frequencies with indexing into

the I/O dimensions. For example, if

sys is an FRD model with two inputs, two

outputs, and frequency vector

[2.1 4.2 5.3],withsys.Units specif ied in

rad / s, the n

sys2 = sys(1,2,'freq',1)

specifies sys2 as a SISO FRD model, with one frequency data point, 2.1 rad/s.

Referencing Channels by Name

You can also extract subsystems using I/O group or channel names. For

example, if

sys has an input group named noise, consisting of channels two,

four, and five, then

sys(1,'noise')

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 648 649

Kommentare zu diesen Handbüchern

Keine Kommentare

MATLAB CONTROL SYSTEM TOOLBOX 9 Betriebsanweisung Seite 112

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein MATLAB CONTROL SYSTEM TOOLBOX 9