R12 Release Notes

Known Software and Documentation Problems

This section updates the Communications Toolbox 2.0 documentation set, reflecting known documentation problems.

Errors in Printed Version of Documentation

The printed version of the Communications Toolbox User's Guide contains several errors that have been corrected in the electronic documentation:

• On page 2-54 (under Example: A Rate-2/3 Feedforward Encoder), the first line of code is missing a right parenthesis before the semicolon. The line should read

trel = poly2trellis([5 4],[27 33 0;0 5 13]); % Define trellis.

• The ddemod reference page indicates that the function's default behavior uses a Butterworth filter. As of Release 12, if num is empty, zero, or absent, then the function does not use a filter.
• The gfadd and gfsub reference pages incorrectly say, " If len is a negative number, then the length of the sum is not altered." In fact, negative values of len cause the function to truncate the arithmetic result.
• The gflineq reference page omits the syntax for solving a linear equation over GF(p) when p > 2. Also, an example there shows an output of x2 =[0; 0; 0] in the case when the linear equation has no solution. As of Release 12, the function returns an empty matrix, x2 = [], in this case.
• The example on the dmodce reference page shows incorrect output. The electronic version has a revised example with accurate output.
• Two documentation examples that use vitdec produce better error statistics than the printed documentation shows. Incorrect output values are on the vitdec reference page and on page 2-52 (under Example: Soft-Decision Decoding).

Upgrading from an Earlier Release

Control System Toolbox 5.0 Release Notes