Download MATLAB SYSTEM IDENTIFICATION TOOLBOX 7 User`s guide

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Using the System Identification Tool GUI
Note To view the entire data range, select Options > Autorange in the
plot window.
Selecting Measured and Noise Channels in Plots
Model inputs and outputs are called channels. When you create a plot of
a multivariable input-output data set or model, the plot only shows one
input-output channel pair at a time. The selected channel names are
displayed in the title bar of the plot window.
Note When you select to plot multiple data sets, and each data set contains
several input and output channels, the Channel menu lists channel pairs
from all data sets.
You can select a different input-output channel pair from the Channel menu
in any System Identification Toolbox plot window.
The Channel menu uses the following notation for channels: u1->y2 means
that the plot displays a transfer function from input channel u1 to output
channel y2. System Identification Toolbox estimates as many noise sources as
there are output channels. In general, e@ynam indicates that the noise source
corresponds to the output with name ynam.
For example, e@y3->y1 means that the transfer function from the noise
channel (associated with y3) to output channel y2 is displayed. For more
information about noise channels, see “Subreferencing Measured and Noise
Models” on page 3-120.
Tip When you import data into the System Identification Tool GUI, it is
helpful to assign meaningful channel names in the Import Data dialog box.
For more information about importing data, see “Representing Data in the
GUI” on page 1-13.
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