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| Contents | Index |
| Learn more about Control System Toolbox |
This table summarizes what's new in Version 8.5 (R2010a):
New Features and Changes | Version Compatibility Considerations | Fixed Bugs and Known Problems | Related Documentation at Web Site |
|---|---|---|---|
Yes | Yes–Details labeled as Compatibility Considerations, below. See also Summary. | Bug Reports | Printable Release Notes: PDF |
New features introduced in this version:
New Commands for Specifying Options for Continuous-Discrete Conversions
New FDEL Command to Remove Specified Data from Frequency Response Data (FRD) Models
The c2d command can now approximate fractional time delays when discretizing linear models with the tustin or matched methods. The new c2dOptions command lets you specify an optional Thiran all-pass filter. The Thiran filter approximates fractional delays for improved phase matching between continuous and discretized models. Previously, c2d rounded fractional time delays to the nearest multiple of the sampling time when using the tustin or matched methods. For more information, see the c2d and c2dOptions reference pages and Converting Between Continuous- and Discrete-Time Representations in the Control System Toolbox™ User Guide.
New commands c2dOptions, d2dOptions, and d2cOptions make it easier to specify options for
Discretization using c2d
Resampling using d2d.
Conversion from discrete to continuous time using d2c.
This release deprecates the prewarp method for c2d, d2d, and d2c. Instead, use c2dOptions, d2dOptions, or d2cOptions to specify the tustin method and a prewarp frequency. For more information, see Converting Between Continuous- and Discrete-Time Representations in the Control System Toolbox User Guide and the c2d, d2d, and d2c reference pages.
You can now remove selected data from frd models using the new fdel command. For example, use fdel to:
Remove spurious or unneeded data from frd models you create from measured frequency response data.
Remove data at intersecting frequencies from frd models before merging them into a single frd model with fcat, which can only merge frd models containing no common frequencies.
For more information, see fdel reference page.
 | Control System Toolbox Release Notes | Version 8.4 (R2009b) Control System Toolbox Software |  |
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