MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 597)

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Purpose Provide the output/input/array dimensions of LTI models, the model order of

TF, SS, and ZPK models, and the number of frequencies of FRD models

Syntax size(sys)

d = size(sys)

Ny = size(sys,1)

Nu = size(sys,2)

Sk = size(sys,2+k)

Ns = size(sys,'order')

Nf = size(sys,'frequency')

Description When invoked without output a rguments, size(sys) returns a vector of the

number of outputs and inputs for a single LTI model. The lengths of the array

dimensions are also included in the responset o

size when sys is an LTI array.

size is the overloaded version of the MATLAB function size for LTI objects.

d = size(sys) returns:

• The row vector

d = [Ny Nu] for a single LTI model sys with Ny outputs and

Nu inputs

• The row vector

d = [Ny Nu S1 S2 ... Sp] for an S1-by-S2-by-...-by-Sp array

of LTI models with

Ny outputs and Nu inputs

Ny = size(sys,1) returns the number of outputs of sys.

Nu = size(sys,2) returns the number of inputs of sys.

Sk = size(sys,2+k) returns the length of the k-th array dimension when sys

is an LTI array.

Ns = size(sys,'order') returns the model order of a TF, SS, or ZPK model.

This is the same as t he number of states for state-space models. When

sys is

an LTI array of SS models with differing numb ers of states in each model:

•

Ns is the multidimensional array of the orders of each of the models in the

LTI array.

• The dimensions of

Ns are given by the array dimensions of the LTI array sys.

Nf = size(sys,'frequency') returns the number of frequencies when sys is

an FRD. This is the same as the length of

sys.frequency.

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