Source: libmath-quaternion-perl Maintainer: Debian Perl Group Uploaders: Dima Kogan Section: perl Testsuite: autopkgtest-pkg-perl Priority: optional Build-Depends: debhelper-compat (= 13) Build-Depends-Indep: perl Standards-Version: 3.9.8 Vcs-Browser: https://salsa.debian.org/perl-team/modules/packages/libmath-quaternion-perl Vcs-Git: https://salsa.debian.org/perl-team/modules/packages/libmath-quaternion-perl.git Homepage: https://metacpan.org/release/Math-Quaternion Package: libmath-quaternion-perl Architecture: all Depends: ${misc:Depends}, ${perl:Depends} Description: Perl routines to handle operations on quaternions Math::Quaternion lets you create and manipulate quaternions. A quaternion is a mathematical object developed as a kind of generalization of complex numbers, usually represented by an array of four real numbers, and is often used to represent rotations in three-dimensional space. . See, for example, http://mathworld.wolfram.com/Quaternion.html for more details on the mathematics of quaternions. . Quaternions can be added, subtracted, and scaled just like complex numbers or vectors -- they can also be multiplied, but quaternion multiplication DOES NOT COMMUTE. That is to say, if you have quaternions $q1 and $q2, then in general $q1*$q2 != $q2*$q1. This is related to their use in representing rotations, which also do not commute.