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Summary of important user-visible changes for releases of the quaternion package =============================================================================== quaternion-2.2.1 Release Date: 2014-mm-dd Release Manager: Lukas Reichlin =============================================================================== ** The following functions are now overloaded for quaternions: get set While they offer no new editing features compared to subscripted assignment and reference, they can display the types and dimensions of the quaternion's components if called with one argument: get (q) set (q) ** subsasgn, subsref -- Improved documentation. -- Support assignment of scalar and vector part from other quaternions: q1.v = q2 # assign components x, y and z, leave w untouched =============================================================================== 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. ===============================================================================