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Summary of important user-visible changes for releases of the quaternion package

===============================================================================
quaternion-2.2.0   Release Date: 20yy-mm-dd   Release Manager: Lukas Reichlin
===============================================================================

** eq
   Changed operator semantics of "==" to match those of complex numbers and
   other built-in types.  Quaternion arrays are now compared element-wise.
   The old behavior can be restored by the expression
   
     bool = size_equal (a, b) && all (eq (a, b)(:))

** end
   "end" indexing for quaternions works now as expected.

** The following functions are now overloaded for quaternions:

     arg            isempty         reshape
     cast           isfinite        round
     ceil           isinf           sparse
     cumsum         isnan           squeeze
     fix            isreal          sum
     floor          length          tril
     full           ndims           triu

** The following operators are now overloaded for quaternions:

     ge (>=)        le (<=)         ne (!=, ~=)
     gt (>)         lt (<)

   Since there is no ordering that makes quaternions an ordered field, several
   definitions are possible.  The ordering chosen here is the lexicographic one.

** quaternion
   -- Allow logicals as quaternion components.
   -- When called with one or three arguments, fill missing vector or scalar
      part with zeros of the same class as the given arguments.  Before, always
      doubles were used.


===============================================================================
quaternion-2.0.3   Release Date: 2013-10-28   Release Manager: Lukas Reichlin
===============================================================================

** Compatibility to GNU Octave 3.8
   Replaced line continuation marker "\" by "..." to avoid deprecated syntax
   warning.

** q2rot
   -- The rotation angle now lies in the interval [0, 2*pi].
   -- Fixed bug #39521. (Thanks to Juan Pablo Carbajal and Max Katsev)
      http://savannah.gnu.org/bugs/?39521


===============================================================================
quaternion-2.0.2   Release Date: 2012-10-25   Release Manager: Lukas Reichlin
===============================================================================

** eq
   -- Fix typo bug which gave false positives for the k-component.
   -- Avoid error if arguments are non-conformant.

** size_equal
   Add overloaded method because the built-in function gives false positives
   for quaternions.

** ldivide, mldivide, mpower
   Show error message if the number of input arguments is not 2.


===============================================================================
quaternion-2.0.1   Release Date: 2012-10-14   Release Manager: Lukas Reichlin
===============================================================================

** inv
   Support for the inversion of quaternion matrices.  Right and left division
   operators (/ and \) profit from this change and support quaternion matrices
   as well.

** Check number of arguments when operators are called by their function names,
   e.g. plus (q1, q2, q3).  Function plus supports now more than two arguments.

** doc/quaternion.pdf
   Revised PDF manual.  There is now a function index at the end of the manual.

** The TeX-files  quaternion.tex  and  functions.texi  for generating
   quaternion.pdf  are included in the doc folder, next to  quaternion.pdf.
   Note that  functions.texi  is generated automatically by the scripts in the
   quaternion/devel folder and the package generate_html.
   They are not included in the quaternion package and can be found on the
   OctaveForge SVN server.


===============================================================================
quaternion-2.0.0   Release Date: 2012-03-28   Release Manager: Lukas Reichlin
===============================================================================

** First official release.  Its main features are:
   -- Matrices and n-dimensional arrays of quaternions.
   -- Overloaded operators due to the use of classes.
   -- Operator semantics similar to Octave’s built-in complex numbers.
   -- Vectorized code for crunching large quaternion arrays in a speedy manner.


===============================================================================