If I remember correctly, the inverse of a quaternion (w, x, y, z) is then defined as
(w, x, y, z)^-1 = (w, -x, -y, -z) With the inverse defined, the quotient is defined as q/p = q * p^(-1) In that sense (0, 0, 0, 1)/(0, 1, 0, 0) = (0, 0, 0, 1) * (0, -1, 0, 0) which is well-defined. Yu On Thu, 2009-03-26 at 23:24 +0000, Maciej Piechotka wrote: > William Swanson wrote: > > > --- Quaternions --- > > Quaternions are complex numbers generalized into four dimensions. As > > with complex numbers, all four basic operators (+ - * /) are > > well-defined. Quaternions are used to represent rotations in 3D, among > > other things. > > Nearly. Quaternions doesn't have defined division as: > > i * j = k > -j * i = k > > k/i = j or -j? > > Regards _______________________________________________ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
