[Qtfm-announce] QTFM version 2.6

[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 (c) 2005-2017 Stephen J. Sangwine & Nicolas Le Bihan
Email: san...@us...
       nic...@gi...
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                     Release Notes

Version 2.6  1 August 2017

Fixed a bug in the quaternion plus function that caused addition of scalar
numerics to pure quaternion arrays to fail (e.g. randv(2) + 1 would yield a
result with 1 in the scalar part and a 2-by-2 array in the vector part).
The bug was probably introduced in the previous release by the need to deal
with singleton expansion (see below). The octonion code uses the quaternion
code to perform addition, so the fix also ensures that octonion results are
correct.

Fixed a bug in the ishermitian function whereby it was not checked that the
scalar part was a symmetric matrix. The default tolerance was also relaxed.

The function orthogonal which previously accepted only scalar arguments, is
now vectorised.

The scatter4p3 function now has output parameters which provide access to
the subplot axes, and therefore allow user adjustments to labels, scaling
etc.

*****************
Dr Steve Sangwine
School of Computer Science and Electronic Engineering
University of Essex
Wivenhoe Park
Colchester CO4 3SQ
United Kingdom

T: (+44) (0)1206 872401
F: (+44) (0)1206 872684

http://privatewww.essex.ac.uk/~sjs