MATLAB CONTROL SYSTEM TOOLBOX 9 Specifikace stáhnout pdf (Strana 29)

100

101

Creating LTI Models

2-11

You can specify this MIMO transfer matrix by typing

N = {[1 –1];[1 2]}; % cell array for N(s)

D = {[1 1];[1 4 5]}; % cell array for D(s)

H = tf(N,D)

MATLAB responds with

Transfer function from input to output...

s – 1

#1: -----

s + 1

s + 2

#2: -------------

s^2 + 4 s + 5

Notice that both N and D have the same dimensions as H. For a general MIMO

transfer matrix , the cell array entries

N{i,j} and D{i,j} should be

row-vector representations of the numerator and denominator of , the

entry of the transfer matrix .

Pure Gains

Youcanuse tf withonlyone argumenttospecify simple gainsor gainmatrices

as TF objects. For example,

G = tf([1 0;2 1])

produces the gain matrix

while

E = tf

creates an empty transfer function.

()

s 1–

s 2+

= Ds

()

s 1+

4s 5++

(

)

(

)

(

)

ijth Hs

()

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 590 591

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