Creating and Manipulating Models

The Concept of an LTI Array

To visualize the concept of an LTI array, consider the set of five transfer function models shown below. In this example, each model has two inputs and two outputs. They differ by parameter variations in the individual model components.

Figure 4-1: Five LTI Models to be Collected in an LTI Array

Figure 4-2: An LTI Array Containing These Five Models

Just as you might collect a set of two-by-two matrices in a multidimensional array, you can collect this set of five transfer function models as a list in an LTI array under one variable name, say, sys. Each element of the LTI array is an LTI model.

Individual models in the LTI array sys are accessed via indexing. The general form for the syntax you use to access data in an LTI array is

For example, you can access the third model in sys with sys(:,:,3). The following illustrates how you can use indexing to select models or their components from sys.

Figure 4-3: Using Indices to Select Models and Their Components

See Indexing Into LTI Arrays for more information on indexing.

Where to Find Information on LTI Arrays

Higher Dimensional Arrays of LTI Models