MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur télécharger pdf (Page 633)

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zpkdata

11-243

11zpkdata

Purpose Quick access to zero-pole-gain data

Syntax [z,p,k] = zpkdata(sys)

[z,p,k] = zpkdata(sys,'v')

[z,p,k,Ts,Td] = zpkdata(sys)

Description [z,p,k] = zpkdata(sys) returnst he zerosz,polesp,andgain(s)kof thezero-

pole-gain model

sys.Theoutputszand p are cell arrays with the following

characteristics:

•

z and p have as many rows as outputs and as many columns as inputs.

• The

(i,j) entries z{i,j} and p{i,j} are the (column) vectors o f zeros and

poles of the transfer function from input

j to output i.

The output

k is a matrix with as many rows as outputs and as many columns

as inputs such that

k(i,j) is the gain of the transfer function from input j to

output

i.Ifsys is a transfer function or state-space model, it is first converted

to zero-pole-gain form using

zpk. See Table 11-15, “LTI Properties,” on page

11-195 for more information on the format of state-space model data.

For SISO zero-pole-gain models, the syntax

[z,p,k] = zpkdata(sys,'v')

forces zpkdata to return the zeros and poles directly as column vectors rather

than as cell arrays (see example below).

[z,p,k,Ts,Td] = zpkdata(sys) also returns the sample time Ts and the

input delay data

Td. For continuous-time models, Td is a row vector with one

entry per input channel (

Td(j) indicat e s by how many secondst he jth input is

delayed). For discrete-time models,

Td is the empty matrix [] (see d2d for

delays in discrete systems).

You can access the remaining LTI properties of

sys with get or by direct

referencing, for example,

sys.Ts

sys.inputname

1 2 ... 628 629 630 631 632 633 634 635 636 637 638 ... 648 649

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