/usr/share/octave/packages/communications-1.1.1/egolayenc.m is in octave-communications-common 1.1.1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | ## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
##
## 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} {} egolayenc (@var{M})
##
##
## Given @var{M}, encode M using the Extended Golay code.
##
## The message @var{M}, needs to be of size Nx12, for encoding.
## We can encode several messages, into codes at once, if they
## are stacked in the order suggested.
##
## The generator G used in here is same as obtained from the
## function egolaygen. Extended Golay code (24,12) which can correct
## upto 3 errors.
##
## @example
## @group
## M=(rand(10,12)>0.5);
## C=egolayenc(M)
##
## @end group
## @end example
##
## @end deftypefn
## @seealso{egolaygen,egolaydec}
function C=egolayenc(M)
if ( nargin < 1 )
error('usage: C=egolayenc(M)');
elseif ( columns(M) ~= 12 )
error('extended golay code is (24,12), use message of column size 12');
end
I=eye(12);
P=[1 0 0 0 1 1 1 0 1 1 0 1;
0 0 0 1 1 1 0 1 1 0 1 1;
0 0 1 1 1 0 1 1 0 1 0 1;
0 1 1 1 0 1 1 0 1 0 0 1;
1 1 1 0 1 1 0 1 0 0 0 1;
1 1 0 1 1 0 1 0 0 0 1 1;
1 0 1 1 0 1 0 0 0 1 1 1;
0 1 1 0 1 0 0 0 1 1 1 1;
1 1 0 1 0 0 0 1 1 1 0 1;
1 0 1 0 0 0 1 1 1 0 1 1;
0 1 0 0 0 1 1 1 0 1 1 1;
1 1 1 1 1 1 1 1 1 1 1 0;];
G=[P I]; %generator.
##for rowi=1:rows(M)
## C(rowi,:)=mod(M(rowi,:)*G,2); %code.
##end
C=mod(M*repmat(G,[1,rows(M)]),2);
C=C(:,1:24);
end
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