Summary of important user-visible changes for releases of the quaternion package =============================================================================== quaternion-2.2.0 Release Date: 2014-01-04 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. ===============================================================================