User`s guide

1 Data Processing

Note If your data is complex valued, see “Manipulating Complex-Valued

Data” on page 1-131 for information about supported operations for complex

data.

Support for Data with Uniform and Nonuniform

Sampling Intervals

A sampling interval is the time between successive data samples.

The System Identiﬁcation Toolbox product provides limited support for

nonuniformly sampled d ata. For more information about specifying uniform

and nonuniform time vectors, see “Constructing an iddata Object for

Time-Domain D ata” on page 1-48.

Note The System Identiﬁcation Tool G U I only supports uniformly sampled

data.

Impor ting Time-Domain Data into MATLAB

Time-domain data consists of one or more input variables u(t) and one or more

output variables y(t), sampled as a function of time. If there is no output data,

see “Importing Time-Series D ata into MAT LAB” on page 1-7.

You must import your time -do m a in da ta into the MATL AB work space as

the following variables:

• Input data

For single-input/single-output (SISO) data, the input must be a column

vector.

For a data set with N

inputs and N

samples (measurements), the input is

an N

-by-N

matrix.

• Output data

For single-input/single-out put (SISO ) data, the outpu t must b e a column

vector.

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