Creating and Manipulating Models

Extracting LTI Arrays of Subsystems

To select a particular subset of I/O channels from all the models in an LTI array, use the syntax described in "Extracting and Modifying Subsystems" on page 3-5. For example,

sys = rss(4,3,2,5,2);
A = sys(1, [1 2])

or equivalently,

A = sys(1,[1 2],:,:)

selects the first two input channels, and the first output channel in each model of the LTI array A, and returns the resulting 5-by-2 array of one-output, two-input subsystems.

You can also combine model selection with I/O selection within an LTI array. For example, to access both:

• The state-space model in the (3,2) array position
• Only the portion of that model relating the second input to the first output

type

sys(1,2,3,2)

To access the subsystem from all inputs to the first two output channels of this same array entry, type

sys(1:2,:,3,2)

Accessing Particular Models in an LTI Array

Reassigning Parts of an LTI Array