Learn more about Control System Toolbox

Analyzing MIMO Models

On this page…
Overview of Analyzing MIMO Models Array Selector I/O Grouping for MIMO Models Selecting I/O Pairs

Overview of Analyzing MIMO Models

If you import a MIMO system, or an LTI array containing multiple linear models, you can use special features of the right-click menu to group the response plots by input/output (I/O) pairs or select individual plots for display. For example, if you randomly generate a 3-input, 3-output MIMO system,

   sys_mimo=rss(3,3,3);

and open an LTI Viewer,

   ltiview(sys_mimo);

the default is an unwrapped set of 9 plots, one from each input to each output.

Back to Top

Array Selector

If you import an LTI array into your LTI Viewer, Array Selector appears as an option in the right-click menu. Selecting this option opens the Model Selector for LTI Arrays, shown below.

You can use this window to include or exclude models within the LTI array using various criteria. The following subsections discuss the features in turn.

Arrays

Select which LTI array for applying model selection options by using the Arrays pull-down list.

Selection Criteria

There are two selection criteria. The default, Index into Dimensions, allows you to include or exclude specified indices of the LTI Array. Select systems from the Selection Criteria Setup and specify whether to show or hide the systems using the pull-down menu below the Setup lists.

The second criterion is Bound on Characteristics. Selecting this options causes the Model Selector to reconfigure. The reconfigured window is shown below.

Use this option to select systems for inclusion or exclusion in your LTI Viewer based on their time response characteristics. The panel directly above the buttons describes how to set the inclusion or exclusion criteria based on which selection criteria you select from the reconfigured Selection Criteria Setup panel.

Back to Top

I/O Grouping for MIMO Models

You can group this by inputs, by outputs, or both by selecting I/O Grouping and then Inputs, Outputs, or All, respectively, from the right-click menu.

For example, if you select Outputs, the LTI Viewer reconfigures into 3 plots, one for each input.

Selecting None returns to the default configuration, where all I/O pairs are displayed individually.

Back to Top

Selecting I/O Pairs

Another way to organize MIMO system information is to choose I/O Selector from the right-click menu, which opens the I/O Selector window.

This window automatically configures to the number of I/O pairs in your MIMO system. You can select:

• Any individual plot (only one at a time) by clicking on a button

• Any row or column by clicking on Y(*) or U(*)

• All of the plots by clicking [all]

Using these options, you can inspect individual I/O pairs, or look at particular I/O channels in detail.

Back to Top

Selecting Response Types

Customizing the LTI Viewer

© 1984-2009- The MathWorks, Inc.    -   Site Help   -   Patents   -   Trademarks   -   Privacy Policy   -   Preventing Piracy   -   RSS