[Qtfm-announce] QTFM version 2.1

[Release a. a. u. <qtf...@li...>]

A new release of the Quaternion Toolbox for Matlab (QTFM) has
been posted on Sourceforge.

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                Quaternion toolbox for Matlab
                http://qtfm.sourceforge.net/
       Mailing list: qtf...@li...
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Copyright (©) 2005-2014 Stephen J. Sangwine & Nicolas Le Bihan
Email: sj...@es..., nic...@gi...
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                     Release Notes

Version 2.1  2 May 2014

The Matlab functions plot3 and quiver3 have been overloaded for quaternions.

Two new functions implement general orthogonal plane and hyperplane
decompositions. They are called opd and ohd. They implement a
decomposition of the form (q +/- a q b)./2 where a and b are scalars.

Two new functions fftflip and fftflip2 implement discrete time/frequency
reversal of arrays containing signals or images.

The octonion vector_product function has been re-written, supported
by a study of the references cited within the code.

The octonion functions angle/axis/exp/sqrt have been implemented.

Some initial steps have been taken to enable quaternions to have
logical components as well as numeric. This is a minor change in
functionality, and of course, as soon as you multiply or add quaternions
with such components, Matlab will convert them to double, just as it does
with logical arrays.

There are minor fixes in many functions and files.