X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fquaternion-2.0.0%2F%40quaternion%2Funit.m;fp=octave_packages%2Fquaternion-2.0.0%2F%40quaternion%2Funit.m;h=8a439f0ecaf5594c8c8b8cf9b615a6b9e8706fd2;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/quaternion-2.0.0/@quaternion/unit.m b/octave_packages/quaternion-2.0.0/@quaternion/unit.m
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+## Copyright (C) 2011   Lukas F. Reichlin
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{qn} =} unit (@var{q})
+## Normalize quaternion to length 1 (unit quaternion).
+##
+## @example
+## q = w + x*i + y*j + z*k
+## unit (q) = q ./ sqrt (w.^2 + x.^2 + y.^2 + z.^2)
+## @end example
+## @end deftypefn
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: November 2011
+## Version: 0.1
+
+function q = unit (a)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  q = a ./ abs (a);
+
+endfunction