Creating and Manipulating Models

Time Delays

Using the ioDelay, InputDelay, and OutputDelay properties of LTI objects, you can specify delays in both continuous- and discrete-time LTI models. With these properties, you can, for example, represent:

• LTI models with independent delays for each input/output pair. For example, the continuous-time model with transfer function

• State-space models with delayed inputs and/or delayed outputs. For example,

• where is the time delay between the input and the state vector , and is the time delay between and the output .

You can assign the delay properties ioDelay, InputDelay, and OutputDelay either when first creating your model with the tf, zpk, ss, or frd constructors, or later with the set command (see LTI Properties and Methods for details).

This section contains the following topics:

• Functions that Support Time Delays
• Specifying Input/Output Delays
• Specifying Delays on the Inputs or Outputs
• Specifying Delays in Discrete-Time Models
• Retrieving Information About Delays
• Padé Approximation of Time Delays

Caution About Model Conversions

Functions that Support Time Delays

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