QRDOTMULT multiplies together two real quaternions arrays q=[q1,q2] Inputs: q1(4n,...) q2(4n,...) Two real quaternion arrays of equal size Outputs: q(4n,...) The Hadamard product (i.e. .*) of the input arrays Copyright (C) Mike Brookes 2000-2012 Version: $Id: qrdotmult.m 1618 2012-03-15 09:14:33Z dmb $ VOICEBOX is a MATLAB toolbox for speech processing. Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 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 2 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 can obtain a copy of the GNU General Public License from http://www.gnu.org/copyleft/gpl.html or by writing to Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

- qrmult QRMULT multiplies together two real quaternions matrices q=[q1,q2]

0001 function q=qrdotmult(q1,q2) 0002 %QRDOTMULT multiplies together two real quaternions arrays q=[q1,q2] 0003 % 0004 % Inputs: q1(4n,...) 0005 % q2(4n,...) Two real quaternion arrays of equal size 0006 % 0007 % Outputs: q(4n,...) The Hadamard product (i.e. .*) of the input arrays 0008 % 0009 % Copyright (C) Mike Brookes 2000-2012 0010 % Version: $Id: qrdotmult.m 1618 2012-03-15 09:14:33Z dmb $ 0011 % 0012 % VOICEBOX is a MATLAB toolbox for speech processing. 0013 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0014 % 0015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0016 % This program is free software; you can redistribute it and/or modify 0017 % it under the terms of the GNU General Public License as published by 0018 % the Free Software Foundation; either version 2 of the License, or 0019 % (at your option) any later version. 0020 % 0021 % This program is distributed in the hope that it will be useful, 0022 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0023 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0024 % GNU General Public License for more details. 0025 % 0026 % You can obtain a copy of the GNU General Public License from 0027 % http://www.gnu.org/copyleft/gpl.html or by writing to 0028 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0029 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0030 persistent a b c 0031 if isempty(a) 0032 a=[1 2 3 4 2 1 4 3 3 4 1 2 4 3 2 1]; 0033 b=[1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4]; 0034 c=[2 3 4 7 12 14]; 0035 end 0036 s=size(q1); 0037 qa=reshape(q1,4,[]); 0038 qb=reshape(q2,4,[]); 0039 q=qa(a,:).*qb(b,:); 0040 q(c,:)=-q(c,:); 0041 q=reshape(sum(reshape(q,4,[]),1),s);

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