1 ## Copyright (C) 2011 Lukas F. Reichlin
3 ## This program is free software: you can redistribute it and/or modify
4 ## it under the terms of the GNU General Public License as published by
5 ## the Free Software Foundation, either version 3 of the License, or
6 ## (at your option) any later version.
8 ## This program is distributed in the hope that it will be useful,
9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 ## GNU General Public License for more details.
13 ## You should have received a copy of the GNU General Public License
14 ## along with this program. If not, see <http://www.gnu.org/licenses/>.
17 ## @deftypefn {Function File} {@var{norm2} =} norm2 (@var{q})
18 ## Return squared norm of a quaternion.
21 ## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
22 ## Created: November 2011
25 function ret = norm2 (a)
27 ret = a.w.^2 + a.x.^2 + a.y.^2 + a.z.^2;