MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur télécharger pdf (Page 142)

100

101

4 Arrays of LTI Models

4-10

Note:

• By convention, a single LTI model is treated as a 1-by-1 array of models.

For s ingle LTI models, size returns only the I/O dimensions

[Ny Nu].

• For LTI arrays, size always returns at least two array dimensions.

For example, the size of a 2-by-1 LTI array in

[Ny Nu 2 1]

• size ignores trailing singleton dimensions beyond the second array

dimension.

For example,

size returns [Ny Nu 2 3] for a 2-by-3-by-1-by-1 LTI array of

models with

Ny outputs and Nu inputs.

• You can use the syntax

size(sys,'order') to determine the number of

states inan LTI array,

sys. Amultidimensionalarray is returned ifsys is an

SS model s uch that the numbers of states in each model in

sys are not the

same.

The function

ndims returns the total number of dimensions in an LTI array:

• 2, for single LTI models

• 2+

p, for LTI arrays, where p (greater than 2) is the number of array

dimensions

Note that

ndims (sys) = length(size(sys))

To see how these work on the sample 2-by-3 LTI array m2d of two-output,

one-input models, type

load LTIexamples

s = size(m2d)

s =

2 1 2 3

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 648 649

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