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Version 3.1 (R2010a) Fixed-Point Toolbox Software

This table summarizes what's new in Version 3.1 (R2010a):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes Summary	Bug Reports Includes fixes	Printable Release Notes: PDF Current product documentation

New features and changes introduced in this version are:

• New Handle Object for the Global fimath

• New Global fimath Functions

• New NumericTypeScope for Selecting Fixed-Point Data Types

• New CORDIC Trigonometric Functions

• Fixed-Point Support Added for filter, mean, and median Functions

• Fixed-Point Support Added for mpower (^) and power (.^) Functions

• CastBeforeSum Property Hidden on fimath Objects with a SumMode of FullPrecision

• New and Updated Demos

• Functions Being Removed

New Handle Object for the Global fimath

You can now configure the global fimath and return a handle object to it using the globalfimath function. Doing so makes it easier to change the properties of the global fimath, whether you are working at the MATLAB command line or in a file. See the Functions Being Removed release note for information about the function that globalfimath replaces.

New Global fimath Functions

The following global fimath functions are new in R2010a:

• removeglobalfimathpref

• resetglobalfimath

• saveglobalfimathpref

For information about the functions they replace, see the Functions Being Removed release note.

New NumericTypeScope for Selecting Fixed-Point Data Types

Fixed-Point Toolbox™ software now offers a NumericTypeScope object that can perform a dynamic range analysis on your data. You can use the results of the dynamic range analysis to help you select appropriate numerictype properties for your data.

New CORDIC Trigonometric Functions

Fixed-Point Toolbox software now offers the following CORDIC-based approximation functions:

• cordiccexp

• cordiccos

• cordicsin

• cordicsincos

These functions allow you to compute the sine, cosine, and complex exponential of fixed-point data using the CORDIC approximation method.

Fixed-Point Support Added for filter, mean, and median Functions

Fixed-Point Toolbox software now provides support for the following functions:

• filter

• mean

• median

Fixed-Point Support Added for mpower (^) and power (.^) Functions

Fixed-Point Toolbox software now provides support for the mpower (^) and power (.^) functions.

CastBeforeSum Property Hidden on fimath Objects with a SumMode of FullPrecision

The setting of the CastBeforeSum property does not affect full-precision sums, so effective this release, it is hidden for fimath objects that have a SumMode of FullPrecision. In previous releases, you could not generate code with the Embedded MATLAB^® subset when the CastBeforeSum property of a fimath object was set to False, even if you were only computing full-precision sums.

This change ensures that you can always generate code for full-precision sums using emlmex, emlc, or the Embedded MATLAB Function block. A CastBeforeSum property setting of False no longer causes an error if you are working with full-precision sums.

New and Updated Demos

This release adds the Fixed-Point Sine and Cosine Calculation demo. This demo shows you how to compute the sine and cosine of fixed-point data using the new CORDIC-based approximation functions.

Demos with significant updates this release include the following:

• Fixed-Point Basics — This demo now highlights the functionality of recently added features, including the new handle object for the global fimath.

• Fixed-Point Algorithm Development — This demo now uses the NumericTypeScope object to help select appropriate fixed-point data types.

Functions Being Removed

Function Name	What Happens When You Use the Function?	Use This Instead	Compatibility Considerations
removedefaultfimathpref	Still runs	removeglobalfimathpref	Replace all instances of removedefaultfimathpref with removeglobalfimathpref.
resetdefaultfimath	Still runs	resetglobalfimath	Replace all instances of resetdefaultfimath with resetglobalfimath.
savedefaultfimathpref	Still runs	saveglobalfimathpref	Replace all instances of savedefaultfimathpref with saveglobalfimathpref.
setdefaultfimath	Still runs	globalfimath	Replace all instances of setdefaultfimath with globalfimath.

Fixed-Point Toolbox Release Notes

Version 3.0 (R2009b) Fixed-Point Toolbox Software

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