MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 573)

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zpk

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• z = zpk('z',Ts) to specify a ZPK model with sample time Ts froma rational

transfer function of the discrete-time variable,

Once you specify either of these variables, you can specify ZPK models directly

as real-valued rational expressions in the variable

s or z.

To create a MIMO zero-pole-gain model, specify the zeros, poles, and gain of

each SISO entry of this model. In this case:

•

z and p arecellarraysofvectorswithasmanyrowsasoutputsandasmany

columns as inputs, and

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

many columns as inputs.

• The vectors

z{i,j} and p{i,j} specify the zeros and poles of the transfer

function from input

j to output i.

• k(i,j) specifies the (scalar) gain of the transfer function from input j to

output

See below for a MIMO example.

sys = zpk(z,p,k,Ts) creates a discrete-time zero-pole-gain model with

sample time

Ts (in seconds). Set Ts = -1 or Ts = [] to leave the sample time

unspecified. The input arguments

z, p, k are as in the continuous-time case.

sys = zpk(M) specifies a static gain M.

sys = zpk(z,p,k,ltisys) creates a zero-pole-gain model with generic LTI

properties inherited from the LTI model

ltisys (including the sample time).

See “Generic Properties” on page 2-26 for an overview of generic LTI

properties.

To create an array of ZPK models, use a

for loop, or use multidimensional cell

arrays for

z and p, and a multidimensional array for k.

Any of the previous syntaxes can be followed by property name/property value

pairs.

'PropertyName',PropertyValue

Each pair specifies a particular LTI property of the model, for example, the

input names or the input delay time. See

set entry and the example below for

details. Note that

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