MATLAB CONTROL SYSTEM TOOLBOX 9 Specifications download pdf (Page 58)

100

101

2 LTI Models

2-40

Model Conversion

There are four LTI model types you can use with the Control System Toolbox:

TF,ZPK,SS,andFRD.Thissectionshowshow toconvertmodels fromone type

to the other.

Explicit Conversion

Model conversions are performed by tf, ss, zpk,andfrd. Given any TF, SS, or

ZPK model

sys, the syntax for conversion to another model type is

Notice that FRD models can’t be converted to the other model types. In

addition, you must also include a vector of frequencies (

frequency)asaninput

argument when converting to an FRD model.

For example, you can convert the state-space model

sys = ss(–2,1,1,3)

to a zero-pole-gain model by typing

zpk(sys)

to which MATLAB responds

Zero/pole/gain:

3 (s+2.333)

-----------

(s+2)

Note that the transfer function of a state-space model with data is

for continuous-time models, and

sys = tf(sys) % Conversion to TF

sys = zpk(sys) % Conversion to ZPK

sys = ss(sys) % Conversion to SS

sys = frd(sys,frequency) % Conversion to FRD

ABCD

,,,()

Hs() DCsIA–()

1–

B+=

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 590 591

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MATLAB CONTROL SYSTEM TOOLBOX 9 Specifications Page 58

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