Version 6.0 (R13SP2) System Identification Toolbox™ Software Release Notes

Version 6.0 (R13SP2) System Identification Toolbox Software

This table summarizes what's new in Version 6.0 (R13SP2):

New features and changes introduced in this version are:

• idproc Model Object Added

• Estimation and Validation in Frequency Domain Now Supported

• Continuous-Time Data Can Now Be Stored Using Frequency-Domain Objects

• Simulink Software Now Supports iddata and idmodel Objects

• advice About Data and Models Now Available

• Theta Models No Longer Supported

idproc Model Object Added

A new model object, idproc, is used to represent simple continuous-time process models. This object is characterized by static gain, possible dead time, and dominating time constant(s). A new GUI that supports this object is available in the System Identification Toolbox GUI.

To learn more about this object, type iddemopr at the MATLAB prompt to run a demo.

You can also try the command

m = pem(data,'p1d')

Estimation and Validation in Frequency Domain Now Supported

You can now perform estimation and validation using frequency-domain data, such as the following:

• Inputs and outputs, entered as frequency-domain data in the iddata object

• Frequency-response data from a frequency analyzer

Both System Identification Toolbox functions and the graphical user interface (GUI) support this.

All estimation, simulation, and validation routines accept frequency-domain data and frequency-response data as inputs, similar to time-domain data. The frequency-response data must be packaged as an frd or idfrd object.

Use the fft and ifftfunctions to transform between the time and frequency domains. Use the spafdr function to estimate frequency responses using frequency-dependent resolution.

Type at the MATLAB prompt:

help iddata

or

idprops data 

for complete descriptions. To access a demo, type iddemofr.

Continuous-Time Data Can Now Be Stored Using Frequency-Domain Objects

You can now store continuous-time data as a frequency-domain data object. Continuous-time Fourier-transformed data is now stored at a finite number of arbitrary frequencies, letting you estimate continuous-time models directly. For example, type at the MATLAB prompt:

help oe

Simulink Software Now Supports iddata and idmodel Objects

You can now import and simulate System Identification Toolbox idmodel models in the Simulink environment. You can also import iddata objects into Simulink.

The command slident opens a System Identification block library, which you can use to simulate idmodel models (with or without noise). This library also contains data sources and sinks for iddata objects.

advice About Data and Models Now Available

Use the new advice command to get helpful tips about the quality, problems, and options associated with an iddata or idmodel object.

For more information, type at the MATLAB prompt:

help iddata/advice

and

help idmodel/advice

Theta Models No Longer Supported

Theta models (matrices) are no longer supported.

Functions and Properties Being Removed

For more information about the process of removing functions, see "About Functions and Properties Being Removed" in What's in the Release Notes.

Version 6.1.1 (R14SP2) System Identification Toolbox Software

Compatibility Summary for System Identification Toolbox Software