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6.4 Manipulating a System's Contents
Subsystem and DeleteSubsystem can be used to select or delete a desired part of the system; Subsystem can also rearrange the order of inputs, outputs, or states. The system can be in either state-space or transfer function form (although manipulating state contents is possible for state-space objects only). The element specifications can be either vectors of integers corresponding to indices or the reserved words All or None.
Selecting a part of the system.
Consider a state-space system.
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This picks the subsystem that has only the first and third inputs.
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This swaps the second and third inputs.
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This selects the subsystem that has all inputs, the first output, and the first and third states of the original system ss.
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DeleteSubsystem is complementary to Subsystem and has similar syntax.
Deleting a part of the system.
Here is a transfer function of a system with two inputs and three outputs.
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This deletes the first and third outputs, leaving all the inputs intact.
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MergeSystems merges several systems into one by appending their inputs and outputs (and, for state-space systems, states). The result is in state-space form if at least one of the systems is in this form.
Merging several systems.
Here are two state-space systems.
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This merges them into one. The aggregate has all the inputs, outputs, and states of its components.
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Here are two transfer functions for the two-input, one-output and the one-input, two-output systems, respectively.
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This merges the two transfer functions into one.
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