MATLAB CONTROL SYSTEM TOOLBOX 9 Uživatelská příručka stáhnout pdf (Strana 147)

100

101

Building LTI Arrays

4-15

For the purposes of efficient computation, you can initialize an LTI array to

zero, and then reassign the entire array to the values you w ant to specif y. The

general syntax for zero assignment of LTI arrays is

To initialize

H in the above example to ze ro, type

H = tf(zeros(1,1,2,2));

before you implement the nested for loops.

Building LTI Arrays Using the stack Function

Another way to build LTI arrays is using the function stack. This function

operates on single LTI m odels as well as LTI arrays. It concatenates a list of

LTI arrays or single LTI models only along the array dimension. The general

syntax for

stack is

stack(Arraydim,sys1,sys2...)

where

• Arraydim is the array dimension along which to concatenate the LTI models

or arrays.

•

sys1, sys2, ... are the LTI models or LTI arrays to be concatenated.

Lengths of the array dimensionsLengths of the output/input dimensions

The maximum number of states in any model in the LTI array

sys = tf(zeros(Ny,Nu,S1,...,SK))

sys = zpk(zeros(Ny,Nu,S1,...,SK))

sys = ss(zeros(Ny,Nu,S1,...,SK,Nx))

sys = frd(zeros(Ny,Nu,Nf,S1,...,SK))

The number of frequency vectors in the FRD

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 648 649

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