Version 8.3 (R2009a) Control System Toolbox Software

This table summarizes what's new in Version 8.3 (R2009a):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems
Yes Details below	Yes–Details labeled as Compatibility Considerations, below. See also Summary.	Bug Reports

New change introduced in this version:

Variable q Now Defined as the Forward Shift Operator z

The variable q is now defined in the standard way as the forward shift operator z. Previously, q was defined as z^-1.

Note   This new definition is consistent with the System Identification Toolbox definition of q.

Compatibility Consideration

If you use the q variable, you may receive different results than in previous releases when you:

• Create a transfer function

• Modify the num or den properties of an existing transfer function

The resulting transfer function differs from previous releases when both the

• Variable property is set to q

• num and den properties have different lengths

For example, the following code:

H = tf([1,2],[1 3 8],0.1,'Variable','q')

now returns the transfer function

Previously, the code returned the transfer function

The two transfer functions have different numerators.

Version 8.4 (R2009b) Control System Toolbox Software

Version 8.2 (R2008b) Control System Toolbox Software

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